COMPUTERS

Get unlimited bandwidth from your host for free

noreply@blogger.com (M.S.BINDRA) — Fri, 23 Jan 2009 11:16:00 +0000

This applies only to specific hosting companies, due to the
specific setup needed and does have its drawbacks.

While setting up hosting space with a specific company I often deal
with, I noticed that they used a shared IP. (IP shared by two or more
websites/domains.) Well, the rates for unlimited bandwidth were
around $50+ per month, which I found unreasonable. I didnt require
much space, and didnt want to be limited to a mere 3 gig of traffic
per month.

Back on track... When setting up the acct, the hosting company needs
to know the domain name so that they can direct it accordingly.
(example: 'http://www.123.4.567.890/~user1/ ,
'http://www.123.4.567.890/~user2/ etc)

At this point you can give a url that doesnt belong to you at all. As
long as the nameservers dont change, that should have absolutly no
negative effects on you or your site whatsoever.

How it works is this:
The host propogates you a certain amount space on its servers, and
monitors the traffic that enters their space through the domain its
registered under. Being that the domain isn't connected to the site
at all, it registers ZERO traffic.

Zero traffic registered = can't possibly go over bandwidth
restrictions
can't possibly go over bandwidth restrictions = free unlimited
bandwidth

Now the problems with this (besides the ethical ones) is that your
host may offer X amount of mail addys with the acct
(you@y...) and these will not work, as the name isnt on their
DNS. However, some domain companies allow you to set it up
regardless. Another problem seems to be strictly cosmetic, but can be
highly problematic... Once you attach the domain you want onto the
site, each page comes up/w the ip/UN the host propagated to your
acct. Its at this point where you have to have a phenominal 10-15
character alphanumerical or better (#, &, etc) pw, or your site will
be vulnerable to attack since the attacker already has your UN. This
only gives attackers a slight advantage as the amount of time it
would take to brute force a 10 character pw @ a rate of 1,000,000 per
second is 10 years. Add numbers and case sensitivity to that and it
becomes approx 26,980 years.

While I'm on it, I may as well add that if you use this method,
obviously you are going to be using the lowest cost hosting plan
available, which in turn will offer the least amount of space. Thats
why free hosts were invented.

Free hosts suck as a general rule. Who wants a site smothered in ads?
However, if you upload all your programs, graphics and other large
files (have a backup of course) to a reliable free host and target
them accordingly from your site you have just freed up a signifigant
amount of space. The only setback/w this is having to keep an index
card or file around/w your pws, as you should never use the same one
twice, and want to use complicated ones.

FIND and USE FREE Wi-Fi

noreply@blogger.com (M.S.BINDRA) — Tue, 23 Sep 2008 11:28:00 +0000

Find and Use FREE Wi-Fi INTERNET

VISIT

Anchor Free

Way to modify *.exe files

noreply@blogger.com (M.S.BINDRA) — Sun, 06 Jul 2008 21:20:00 +0000

1) Don't try to modify a prog by editing his source in a dissasembler.Why?
Cause that's for programmers and assembly experts only.
Try to view it in hex you'll only get tons of crap you don't understand.
First off, you need Resource Hacker. It's a resource editor-
very easy to use, You can download it at h**p://www.users.on.net/johnson/resourcehacker/
2) Unzip the archive, and run ResHacker.exe. You can check out the help file too
3) You will see that the interface is simple and clean. Go to the menu FileOpen or press Ctrl+O to open a file. Browse your way to the file you would like to edit. You can edit *.exe, *.dll, *.ocx, *.scr and *.cpl files and *.exe files, so open one.
4) In the left side of the screen a list of sections will appear.
The most common sections are
-String table;
-RCData;
-Dialog;
-Cursor group;
-Bitmap;
-WAV.
*Icon: You can wiew and change the icon(s) of the program by double-clicking the icon section,chossing the icon, right-clicking on it an pressing "replace resource". After that you can choose the icon you want to replace the original with.
*String table: a bunch of crap, useful sometimes, basic programming knowladge needed.
*RCData: Here the real hacking begins. Modify window titles, buttons, text, and lots more!
*Dialog:Here you can modify the messages or dialogs that appear in a program. Don't forget to press "Compile" when you're done!
*Cursor group: Change the mouse cursors used in the program just like you would change the icon.
*Bitmap: View or change images in the programs easy!
*WAV:Change the sounds in the prog. with your own.
5) In the RCData,Dialog,Menu and String table sections you can do a lot of changes. You can modify or translate the text change links, change buttons, etc.

Some TIPS

TIP: To change a window title, search for something like: CAPTION "edit this".
TIP: After all operations press the "Compile Script" button, and when you're done editing save, your work @ FileSave(Save as).
TIP: When you save a file,the original file will be backed up by default and renamed to Name_original and the saved file will have the normal name of the changed prog.
TIP: Sometimes you may get a message like: "This program has a non-standard resource layout... it has probably been compressed with an .EXE compressor." That means that Resource Hacker can't modify it because of it's structure.

How To Delete Persistent Nasty Files

noreply@blogger.com (M.S.BINDRA) — Sun, 06 Jul 2008 21:20:00 +0000

For those who use some other character map other than standard US ASCII, there sometimes happen some files, who has some nasty characters in its name, which appears in your Windows Explorer but when you try to delete it, it says system cannot find the file. In order to delete -or rename, whichever you like- that nasty file, you can use any ftp client with a visual GUI, like WS-FTP or so. In the ftp client's browser window, go to the folder containing that file and edit/delete it in there.

Way to overburn a CD with Nero

noreply@blogger.com (M.S.BINDRA) — Sun, 06 Jul 2008 21:08:00 +0000

Start Nero
From the action-bar select File and select Preferences.
In the Preferences window, select Expert Features(1) and check the Enable overburn disc-at-once(2).
Choose a Maximum CD Length(3) and click OK(4)

For a more accurate test you can use a nero tool called nero speed test to see how much a specific CD is capable of being overburned . get it here

From the action-bar select File and select Write CD.

A window will appear when you have exceeded expected length, click OK to start the overburn copy.

Remember to set disk to burn Disc at Once, you cannot overburn in Track at Once Mode.

Way to Delete An "undeletable" File

noreply@blogger.com (M.S.BINDRA) — Sun, 06 Jul 2008 21:08:00 +0000

Open a Command Prompt window and leave it open.
Close all open programs.
Click Start, Run and enter TASKMGR.EXE
Go to the Processes tab and End Process on Explorer.exe.
Leave Task Manager open.
Go back to the Command Prompt window and change to the directory the AVI (or other undeletable file) is located in.
At the command prompt type DEL where is the file you wish to delete.
Go back to Task Manager, click File, New Task and enter EXPLORER.EXE to restart the GUI shell.
Close Task Manager.

Or you can try this

Open Notepad.exe

Click File>Save As..>

locate the folder where ur undeletable file is

Choose 'All files' from the file type box

click once on the file u wanna delete so its name appears in the 'filename' box

put a " at the start and end of the filename
(the filename should have the extension of the undeletable file so it will overwrite it)

click save,

It should ask u to overwrite the existing file, choose yes and u can delete it as normal

Here's a manual way of doing it. I'll take this off once you put into your first post zain.

1. Start
2. Run
3. Type: command
4. To move into a directory type: cd c:\*** (The stars stand for your folder)
5. If you cannot access the folder because it has spaces for example Program Files or Kazaa Lite folder you have to do the following. instead of typing in the full folder name only take the first 6 letters then put a ~ and then 1 without spaces. Example: cd c:\progra~1\kazaal~1
6. Once your in the folder the non-deletable file it in type in dir - a list will come up with everything inside.
7. Now to delete the file type in del ***.bmp, txt, jpg, avi, etc... And if the file name has spaces you would use the special 1st 6 letters followed by a ~ and a 1 rule. Example: if your file name was bad file.bmp you would type once in the specific folder thorugh command, del badfil~1.bmp and your file should be gone. Make sure to type in the correct extension.

What is Computer Networking ?

noreply@blogger.com (M.S.BINDRA) — Sat, 05 Jul 2008 19:46:00 +0000

Computer networking is the engineering discipline concerned with communication between computer systems or devices. Networking, routers, routing protocols, and networking over the public Internet have their specifications defined in documents called RFCs.[1]

Computer networking is sometimes considered a sub-discipline of telecommunications, computer science, information technology and/or computer engineering. Computer networks rely heavily upon the theoretical and practical application of these scientific and engineering disciplines.

A computer network is any set of computers or devices connected to each other with the ability to exchange data.[2] Examples of networks are:
local area network (LAN), which is usually a small network constrained to a small geographic area.
wide area network (WAN) that is usually a larger network that covers a large geographic area.
wireless LANs and WANs (WLAN & WWAN) is the wireless equivalent of the LAN and WAN

All networks are interconnected to allow communication with a variety of different kinds of media, which including twisted-pair copper wire cable, coaxial cable, optical fiber, and various wireless technologies.[3] The devices can be separated by a few meters (e.g. via Bluetooth) or nearly unlimited distances (e.g. via the interconnections of the Internet[4]).

MacBook Pro by Apple (First in Market)

noreply@blogger.com (M.S.BINDRA) — Wed, 25 Jun 2008 19:45:00 +0000

The first Mac notebook built upon Intel Core 2 Duo with iLife ’06, Front Row and built-in iSight. Starting at $1999.

Learn more about MacBook Pro!

Buy Now!

Learn about Instant Financing!

MacBook by Apple

noreply@blogger.com (M.S.BINDRA) — Wed, 25 Jun 2008 19:28:00 +0000

Up to 2GHz of pure Intel Core 2 Duo power, an iSight camera, Front Row, iLife ’06, and a 13-inch glossy widescreen display, starting at $1099.

Learn more about MacBook Pro!

Buy Now!

Learn about Instant Financing!

Way to add Window Tips of Your CHOICE

noreply@blogger.com (M.S.BINDRA) — Wed, 25 Jun 2008 19:06:00 +0000

Sick of seeing the same tips again and again when you first logon to Windows?
Now you can change them to whatever you want, whether it's quotes, jokes or a to-do list, anything is possible.

WAY Is

Open your registry and find the key below.

HKEY_LOCAL_MACHINE\ SOFTWARE\ Microsoft\ Windows\ CurrentVersion\ Explorer\ Tips

Create a new string valued named by incrementing the existing value names and set it to the required tip text.

eg. 32 - Dont forget to Visit CORE NETWORKING

Transfer of songs from IPOD to LAPTOP

noreply@blogger.com (M.S.BINDRA) — Wed, 25 Jun 2008 18:24:00 +0000

1. Connect the iPod to your LAPTOP. If iTunes starts syncing (ie erasing) the music automatically, hit the X in the upper right hand corner of iTunes display, to the left of the search box, to stop it.
2. In Control Panel, Portable Media Devices, double-click your iPod.
3. Navigate to the Music folder.
4. Select all the music folders, and drag and drop them into a folder on your hard drive, or directly into iTunes.

And a SUCCESS

Laptop Mouse

noreply@blogger.com (M.S.BINDRA) — Sat, 21 Jun 2008 20:02:00 +0000

The SlimBlade Bluetooth Presenter Mouse is a Bluetooth-equipped mouse that works with Mac OS X and Windows. It costs $49.99, and features a two-button design with click wheel and laser-accurate optical tracking. The mouse goes into sleep mode when your notebook does to conserve power.

Way to Keep Laptop SAFE

noreply@blogger.com (M.S.BINDRA) — Sat, 21 Jun 2008 19:49:00 +0000

Kensington has also introduced a new line of “ComboSaver” notebook locks, designed to help reduce the likelihood of laptop theft. They connect to your laptop using a t-bar locking mechanism and come in different configurations and colors at prices from $24.99 to $39.99.
Visit Kensington’s web site for more details.

How to Update BIOS

noreply@blogger.com (M.S.BINDRA) — Fri, 13 Jun 2008 05:19:00 +0000

All latest Motherboards today, 486/ Pentium / Pentium Pro etc.,ensure that upgrades are easily obtained by incorporating the system BIOS in a FLASH Memory component. With FLASH BIOS, there is no need to replace an EPROM component. Once downloaded, the upgrade utility fits on a floppy disc allowing the user to save, verify and update the system BIOS. A hard drive or a network drive can also be used to run the newer upgrade utilities. However, memory managers can not be installed while upgrading.

Most pre-Pentium motherboards do not have a Flash BIOS. The following instructions therefore do not apply to these boards. If your motherboard does not have a Flash BIOS (EEPROM) you will need to use an EPROM programmer to re-program the BIOS chip. See your dealer for more information about this.

Please read the following instructions in full before starting a Flash BIOS upgrade:
A. Create a Bootable Floppy (in DOS)

•With a non-formatted disk, type the following:

format a:/s

•If using a formatted disk, type:

sys a:

This procedure will ensure a clean boot when you are flashing the new BIOS.

B. Download the BIOS file

•Download the correct BIOS file by clicking on the file name of the BIOS file you wish to download.

•Save the BIOS file and the Flash Utility file in the boot disk you have created. Unzip the BIOS file and the flash utility file. If you don't have an "unzip" utility, download the WinZip for Windows 95 shareware/ evaluation copy for that one time use from _www.winzip.com or _www.pkware.com. Most CD ROMs found in computer magazines, have a shareware version of WinZip on them.

•You should have extracted two files:

Flash BIOS utility eg: flash7265.exe (for example)

BIOS eg: 6152J900.bin (example)

Use the latest flash utility available unless otherwise specified (either on the BIOS update page or in the archive file). This information is usually provided.

C. Upgrade the System BIOS

During boot up, write down the old BIOS version because you will need to use it for the BIOS backup file name.

Place the bootable floppy disk containing the BIOS file and the Flash Utility in drive a, and reboot the system in MS-DOS, preferably Version 6.22

•At the A:> prompt, type the corresponding Flash BIOS utility and the BIOS file with its extension.

For example:

flash625 615j900.bin

•From the Flash Memory Writer menu, select "Y" to "Do you want to save BIOS?" if you want to save (back up) your current BIOS (strongly recommended), then type the name of your current BIOS and its extension after FILE NAME TO SAVE: eg: a:\613J900.bin

Alternatively select "N" if you don't want to save your current BIOS. Beware, though, that you won't be able to recover from a possible failure.

•Select "Y" to "Are you sure to program?"

•Wait until it displays "Message: Power Off or Reset the system"

Once the BIOS has been successfully loaded, remove the floppy disk and reboot the system. If you write to BIOS but cannot complete the procedure, do not switch off, because the computer will not be able to boo, and you will not be given another chance to flash. In this case leave your system on until you resolve the problem (flashing BIOS with old file is a possible solution, provided you've made a backup before)

Make sure the new BIOS version has been loaded properly by taking note of the BIOS identifier as the system is rebooting.

For AMI BIOS
Once the BIOS has been successfully loaded, remove the floppy disk and reboot the system holding the "END" key prior to power on until you enter CMOS setup. If you do not do this the first time booting up after upgrading the BIOS, the system will hang.

BIOS Update Tips
note:
1.Make sure never to turn off or reset your computer during the flash process. This will corrupt the BIOS data. We also recommend that you make a copy of your current BIOS on the bootable floppy so you can reflash it if you need to. (This option is not available when flashing an AMI BIOS).

2. If you have problems installing your new BIOS please check the following:

Have you done a clean boot?
In other words, did you follow the above procedure for making a bootable floppy? This ensures that when booting from "A" there are no device drivers on the diskette. Failing to do a clean boot is the most common cause for getting a "Memory Insufficient" error message when attempting to flash a BIOS.

If you have not used a bootable floppy, insure a clean boot either by

a) pressing F5 during bootup

b) by removing all device drivers on the CONFIG.SYS including the HIMEM.SYS. Do this by using the EDIT command.

Have you booted up under DOS?
Booting in Windows is another common cause for getting a "Memory Insufficient" error message when attempting to flash a BIOS. Make sure to boot up to DOS with a minimum set of drivers. Important: Booting in DOS does not mean selecting "Restart computer in MS-DOS Mode" from Windows98/95 shutdown menu or going to Prompt mode in WindowsNT, but rather following the above procedure (format a: /s and rebooting from a:\).

Have you entered the full file name of the flash utility and the BIOS plus its extension?
Do not forget that often you will need to add a drive letter (a:\) before flashing the BIOS. Example: when asked for file name of new BIOS file which is on your floppy disk, in case you're working from c:\ your will need to type a:\615j900.bin, rather than 615j900.bin only.

Setting Up A Ftp

noreply@blogger.com (M.S.BINDRA) — Fri, 13 Jun 2008 05:14:00 +0000

Well, since many of us have always wondered this, here it is. Long and drawn out. Also, before attempting this, realize one thing; You will have to give up your time, effort, bandwidth, and security to have a quality ftp server.
That being said, here it goes. First of all, find out if your IP (Internet Protocol) is static (not changing) or dynamic (changes everytime you log on). To do this, first consider the fact if you have a dial up modem. If you do, chances are about 999 999 out of 1 000 000 that your IP is dynamic. To make it static, just go to a place like h*tp://www.myftp.org/ to register for a static ip address.

You'll then need to get your IP. This can be done by doing this:
Going to Start -> Run -> winipcfg or www.ask.com and asking 'What is my IP?'

After doing so, you'll need to download an FTP server client. Personally, I'd recommend G6 FTP Server, Serv-U FTPor Bullitproof v2.15 all three of which are extremely reliable, and the norm of the ftp world.
You can download them on this site: h*tp://www.liaokai.com/softw_en/d_index.htm

First, you'll have to set up your ftp. For this guide, I will use step-by-step instructions for G6. First, you'll have to go into 'Setup -> General'. From here, type in your port # (default is 21). I recommend something unique, or something a bit larger (ex: 3069). If you want to, check the number of max users (this sets the amount of simultaneous maximum users on your server at once performing actions - The more on at once, the slower the connection and vice versa).

The below options are then chooseable:
-Launch with windows
-Activate FTP Server on Start-up
-Put into tray on startup
-Allow multiple instances
-Show "Loading..." status at startup
-Scan drive(s) at startup
-Confirm exit

You can do what you want with these, as they are pretty self explanatory. The scan drive feature is nice, as is the 2nd and the last option. From here, click the 'options' text on the left column.

To protect your server, you should check 'login check' and 'password check', 'Show relative path (a must!)', and any other options you feel you'll need. After doing so, click the 'advanced' text in the left column. You should then leave the buffer size on the default (unless of course you know what you're doing ), and then allow the type of ftp you want.

Uploading and downloading is usually good, but it's up to you if you want to allow uploads and/or downloads. For the server priority, that will determine how much conventional memory will be used and how much 'effort' will go into making your server run smoothly.

Anti-hammering is also good, as it prevents people from slowing down your speed. From here, click 'Log Options' from the left column. If you would like to see and record every single command and clutter up your screen, leave the defaults.

But, if you would like to see what is going on with the lowest possible space taken, click 'Screen' in the top column. You should then check off 'Log successful logins', and all of the options in the client directry, except 'Log directory changes'. After doing so, click 'Ok' in the bottom left corner.

You will then have to go into 'Setup -> User Accounts' (or ctrl & u). From here, you should click on the right most column, and right click. Choose 'Add', and choose the username(s) you would like people to have access to.

After giving a name (ex: themoonlanding), you will have to give them a set password in the bottom column (ex: wasfaked). For the 'Home IP' directory, (if you registered with a static server, check 'All IP Homes'. If your IP is static by default, choose your IP from the list. You will then have to right click in the very center column, and choose 'Add'.

From here, you will have to set the directory you want the people to have access to. After choosing the directory, I suggest you choose the options 'Read', 'List', and 'Subdirs', unless of course you know what you're doing . After doing so, make an 'upload' folder in the directory, and choose to 'add' this folder seperately to the center column. Choose 'write', 'append', 'make', 'list', and 'subdirs'. This will allow them to upload only to specific folders (your upload folder).

Now click on 'Miscellaneous' from the left column. Choose 'enable account', your time-out (how long it takes for people to remain idle before you automatically kick them off), the maximum number of users for this name, the maximum number of connections allowed simultaneously for one ip address, show relative path (a must!), and any other things at the bottom you'd like to have. Now click 'Ok'.
**Requested**

From this main menu, click the little boxing glove icon in the top corner, and right click and unchoose the hit-o-meter for both uploads and downloads (with this you can monitor IP activity). Now click the lightning bolt, and your server is now up and running.

Post your ftp info, like this:

213.10.93.141 (or something else, such as: 'f*p://example.getmyip.com')

User: *** (The username of the client)

Pass: *** (The password)

Port: *** (The port number you chose)

So make a FTP and join the FTP section

Listing The Contents Of A Ftp:

Listing the content of a FTP is very simple.
You will need FTP Content Maker, which can be downloaded from here:
ht*p://www.etplanet.com/download/application/FTP%20Content%20Maker%201.02.zip

1. Put in the IP of the server. Do not put "ftp://" or a "/" because it will not work if you do so.
2. Put in the port. If the port is the default number, 21, you do not have to enter it.
3. Put in the username and password in the appropriate fields. If the login is anonymous, you do not have to enter it.
4. If you want to list a specific directory of the FTP, place it in the directory field. Otherwise, do not enter anything in the directory field.
5. Click "Take the List!"
6. After the list has been taken, click the UBB output tab, and copy and paste to wherever you want it.

If FTP Content Maker is not working, it is probably because the server does not utilize Serv-U Software.

If you get this error message:
StatusCode = 550
LastResponse was : 'Unable to open local file test-ftp'
Error = 550 (Unable to open local file test-ftp)
Error = Unable to open local file test-ftp = 550
Close and restart FTP Content Maker, then try again.

error messages:

110 Restart marker reply. In this case, the text is exact and not left to the particular implementation; it must read: MARK yyyy = mmmm Where yyyy is User-process data stream marker, and mmmm server's equivalent marker (note the spaces between markers and "=").
120 Service ready in nnn minutes.
125 Data connection already open; transfer starting.
150 File status okay; about to open data connection.
200 Command okay.
202 Command not implemented, superfluous at this site.
211 System status, or system help reply.
212 Directory status.
213 File status.
214 Help message. On how to use the server or the meaning of a particular non-standard command. This reply is useful only to the human user.
215 NAME system type. Where NAME is an official system name from the list in the Assigned Numbers document.
220 Service ready for new user.
221 Service closing control connection. Logged out if appropriate.
225 Data connection open; no transfer in progress.
226 Closing data connection. Requested file action successful (for example, file transfer or file abort).
227 Entering Passive Mode (h1,h2,h3,h4,p1,p2).
230 User logged in, proceed.
250 Requested file action okay, completed.
257 "PATHNAME" created.
331 User name okay, need password.
332 Need account for login.
350 Requested file action pending further information.
421 Too many users logged to the same account
425 Can't open data connection.
426 Connection closed; transfer aborted.
450 Requested file action not taken. File unavailable (e.g., file busy).
451 Requested action aborted: local error in processing.
452 Requested action not taken. Insufficient storage space in system.
500 Syntax error, command unrecognized. This may include errors such as command line too long.
501 Syntax error in parameters or arguments.
502 Command not implemented.
503 Bad sequence of commands.
504 Command not implemented for that parameter.
530 Not logged in.
532 Need account for storing files.
550 Requested action not taken. File unavailable (e.g., file not found, no access).
551 Requested action aborted: page type unknown.
552 Requested file action aborted. Exceeded storage allocation (for current directory or dataset).
553 Requested action not taken. File name not allowed.

Active FTP vs. Passive FTP, a Definitive Explanation

Introduction
One of the most commonly seen questions when dealing with firewalls and other Internet connectivity issues is the difference between active and passive FTP and how best to support either or both of them. Hopefully the following text will help to clear up some of the confusion over how to support FTP in a firewalled environment.

This may not be the definitive explanation, as the title claims, however, I've heard enough good feedback and seen this document linked in enough places to know that quite a few people have found it to be useful. I am always looking for ways to improve things though, and if you find something that is not quite clear or needs more explanation, please let me know! Recent additions to this document include the examples of both active and passive command line FTP sessions. These session examples should help make things a bit clearer. They also provide a nice picture into what goes on behind the scenes during an FTP session. Now, on to the information...

The Basics
FTP is a TCP based service exclusively. There is no UDP component to FTP. FTP is an unusual service in that it utilizes two ports, a 'data' port and a 'command' port (also known as the control port). Traditionally these are port 21 for the command port and port 20 for the data port. The confusion begins however, when we find that depending on the mode, the data port is not always on port 20.

Active FTP
In active mode FTP the client connects from a random unprivileged port (N > 1024) to the FTP server's command port, port 21. Then, the client starts listening to port N+1 and sends the FTP command PORT N+1 to the FTP server. The server will then connect back to the client's specified data port from its local data port, which is port 20.

From the server-side firewall's standpoint, to support active mode FTP the following communication channels need to be opened:

FTP server's port 21 from anywhere (Client initiates connection)
FTP server's port 21 to ports > 1024 (Server responds to client's control port)
FTP server's port 20 to ports > 1024 (Server initiates data connection to client's data port)
FTP server's port 20 from ports > 1024 (Client sends ACKs to server's data port)

In step 1, the client's command port contacts the server's command port and sends the command PORT 1027. The server then sends an ACK back to the client's command port in step 2. In step 3 the server initiates a connection on its local data port to the data port the client specified earlier. Finally, the client sends an ACK back as shown in step 4.

The main problem with active mode FTP actually falls on the client side. The FTP client doesn't make the actual connection to the data port of the server--it simply tells the server what port it is listening on and the server connects back to the specified port on the client. From the client side firewall this appears to be an outside system initiating a connection to an internal client--something that is usually blocked.

Active FTP Example
Below is an actual example of an active FTP session. The only things that have been changed are the server names, IP addresses, and user names. In this example an FTP session is initiated from testbox1.slacksite.com (192.168.150.80), a linux box running the standard FTP command line client, to testbox2.slacksite.com (192.168.150.90), a linux box running ProFTPd 1.2.2RC2. The debugging (-d) flag is used with the FTP client to show what is going on behind the scenes. Everything in red is the debugging output which shows the actual FTP commands being sent to the server and the responses generated from those commands. Normal server output is shown in black, and user input is in bold.

There are a few interesting things to consider about this dialog. Notice that when the PORT command is issued, it specifies a port on the client (192.168.150.80) system, rather than the server. We will see the opposite behavior when we use passive FTP. While we are on the subject, a quick note about the format of the PORT command. As you can see in the example below it is formatted as a series of six numbers separated by commas. The first four octets are the IP address while the second two octets comprise the port that will be used for the data connection. To find the actual port multiply the fifth octet by 256 and then add the sixth octet to the total. Thus in the example below the port number is ( (14*256) + 178), or 3762. A quick check with netstat should confirm this information.

testbox1: {/home/p-t/slacker/public_html} % ftp -d testbox2
Connected to testbox2.slacksite.com.
220 testbox2.slacksite.com FTP server ready.
Name (testbox2:slacker): slacker
---> USER slacker
331 Password required for slacker.
Password: TmpPass
---> PASS XXXX
230 User slacker logged in.
---> SYST
215 UNIX Type: L8
Remote system type is UNIX.
Using binary mode to transfer files.
ftp> ls
ftp: setsockopt (ignored): Permission denied
---> PORT 192,168,150,80,14,178
200 PORT command successful.
---> LIST
150 Opening ASCII mode data connection for file list.
drwx------ 3 slacker users 104 Jul 27 01:45 public_html
226 Transfer complete.
ftp> quit
---> QUIT
221 Goodbye.

Passive FTP
In order to resolve the issue of the server initiating the connection to the client a different method for FTP connections was developed. This was known as passive mode, or PASV, after the command used by the client to tell the server it is in passive mode.

In passive mode FTP the client initiates both connections to the server, solving the problem of firewalls filtering the incoming data port connection to the client from the server. When opening an FTP connection, the client opens two random unprivileged ports locally (N > 1024 and N+1). The first port contacts the server on port 21, but instead of then issuing a PORT command and allowing the server to connect back to its data port, the client will issue the PASV command. The result of this is that the server then opens a random unprivileged port (P > 1024) and sends the PORT P command back to the client. The client then initiates the connection from port N+1 to port P on the server to transfer data.

From the server-side firewall's standpoint, to support passive mode FTP the following communication channels need to be opened:

FTP server's port 21 from anywhere (Client initiates connection)
FTP server's port 21 to ports > 1024 (Server responds to client's control port)
FTP server's ports > 1024 from anywhere (Client initiates data connection to random port specified by server)
FTP server's ports > 1024 to remote ports > 1024 (Server sends ACKs (and data) to client's data port)

In step 1, the client contacts the server on the command port and issues the PASV command. The server then replies in step 2 with PORT 2024, telling the client which port it is listening to for the data connection. In step 3 the client then initiates the data connection from its data port to the specified server data port. Finally, the server sends back an ACK in step 4 to the client's data port.

While passive mode FTP solves many of the problems from the client side, it opens up a whole range of problems on the server side. The biggest issue is the need to allow any remote connection to high numbered ports on the server. Fortunately, many FTP daemons, including the popular WU-FTPD allow the administrator to specify a range of ports which the FTP server will use. See Appendix 1 for more information.

The second issue involves supporting and troubleshooting clients which do (or do not) support passive mode. As an example, the command line FTP utility provided with Solaris does not support passive mode, necessitating a third-party FTP client, such as ncftp.

With the massive popularity of the World Wide Web, many people prefer to use their web browser as an FTP client. Most browsers only support passive mode when accessing ftp:// URLs. This can either be good or bad depending on what the servers and firewalls are configured to support.

Passive FTP Example
Below is an actual example of a passive FTP session. The only things that have been changed are the server names, IP addresses, and user names. In this example an FTP session is initiated from testbox1.slacksite.com (192.168.150.80), a linux box running the standard FTP command line client, to testbox2.slacksite.com (192.168.150.90), a linux box running ProFTPd 1.2.2RC2. The debugging (-d) flag is used with the FTP client to show what is going on behind the scenes. Everything in red is the debugging output which shows the actual FTP commands being sent to the server and the responses generated from those commands. Normal server output is shown in black, and user input is in bold.

Notice the difference in the PORT command in this example as opposed to the active FTP example. Here, we see a port being opened on the server (192.168.150.90) system, rather than the client. See the discussion about the format of the PORT command above, in the Active FTP Example section.

testbox1: {/home/p-t/slacker/public_html} % ftp -d testbox2
Connected to testbox2.slacksite.com.
220 testbox2.slacksite.com FTP server ready.
Name (testbox2:slacker): slacker
---> USER slacker
331 Password required for slacker.
Password: TmpPass
---> PASS XXXX
230 User slacker logged in.
---> SYST
215 UNIX Type: L8
Remote system type is UNIX.
Using binary mode to transfer files.
ftp> passive
Passive mode on.
ftp> ls
ftp: setsockopt (ignored): Permission denied
---> PASV
227 Entering Passive Mode (192,168,150,90,195,149).
---> LIST
150 Opening ASCII mode data connection for file list
drwx------ 3 slacker users 104 Jul 27 01:45 public_html
226 Transfer complete.
ftp> quit
---> QUIT
221 Goodbye.

Summary
The following chart should help admins remember how each FTP mode works:

Active FTP :
command : client >1024 -> server 21
data : client >1024 <- server 20

Passive FTP :
command : client >1024 -> server 21
data : client >1024 -> server >1024

A quick summary of the pros and cons of active vs. passive FTP is also in order:

Active FTP is beneficial to the FTP server admin, but detrimental to the client side admin. The FTP server attempts to make connections to random high ports on the client, which would almost certainly be blocked by a firewall on the client side. Passive FTP is beneficial to the client, but detrimental to the FTP server admin. The client will make both connections to the server, but one of them will be to a random high port, which would almost certainly be blocked by a firewall on the server side.

Luckily, there is somewhat of a compromise. Since admins running FTP servers will need to make their servers accessible to the greatest number of clients, they will almost certainly need to support passive FTP. The exposure of high level ports on the server can be minimized by specifying a limited port range for the FTP server to use. Thus, everything except for this range of ports can be firewalled on the server side. While this doesn't eliminate all risk to the server, it decreases it tremendously.

254 Technical Books(COMPUTERS)

noreply@blogger.com (M.S.BINDRA) — Thu, 12 Jun 2008 15:26:00 +0000

1
10 minute guide to lotus notes mail 4.5
http://www.parsian.net/set1252/pages/books.htm

2
10 minute guide to Microsoft exchange 5.0
http://www.parsian.net/set1252/pages/books.htm

3
10 minute guide to outlook 97
http://www.parsian.net/set1252/pages/books.htm

4
10 minute guide to schedule+ for windows 95
http://www.parsian.net/set1252/pages/books.htm

5
ActiveX programming unleashed
http://www.parsian.net/set1252/pages/books.htm

6
ActiveX programming unleashed
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

7
Advanced perl programming
http://www.hk8.org/old_web/

8
Advanced PL/SQL programming with packages
http://www.hk8.org/old_web/

9
Adventure in Prolog/AMZI
www.oopweb.com

10
Algorithms CMSC251/Mount, David
www.oopweb.com

11
Alison Balter's Mastering Access 95 development, premier ed.
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

12
Apache : The definitive guide, 3rd.ed.
http://www.hk8.org/old_web/

13
Beej's guide to network programming/Hall, Brain
www.oopweb.com

14
Beyond Linux from Scratch/BLFS Development Team
http://book.onairweb.net/computer/os/linux/Administration/Beyond_Linux_From_Scratch/

15
Borland C++ builder unleashed
http://www.parsian.net/set1252/pages/books.htm

16
Building an intranet with windows NT 4
http://www.parsian.net/set1252/pages/books.htm

17
Building an Intranet with Windows NT 4
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

18
Building expert systems in prolog/AMZI
www.oopweb.com

19
C programming language
http://book.onairweb.net/computer/pl/C/The_C_Programming_Language_by_K&R/

20
C Programming/Holmes, Steven
www.oopweb.com

21
C++ Annotations
www.oopweb.com

22
CGI developer's guide
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

23
CGI manual of style
http://www.parsian.net/set1252/pages/books.htm

24
CGI manual of style online
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

25
CGI programming
http://www.hk8.org/old_web/

26
CGI programming unleashed
http://www.parsian.net/set1252/pages/books.htm

27
CGI programming with Perl, 2nd.ed.
http://www.hk8.org/old_web/

28
Charlie Calvert's Borland C++ builder unleashed
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

29
Client/server computing, 2nd.ed.
http://www.parsian.net/set1252/pages/books.htm

30
Client-server computing, 2nd.ed.
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

31
Common LISP, the language/Steele, Guy
www.oopweb.com

32
Compilers and compiler generators : an introduction with C++/Terry, P.D.
www.oopweb.com

33
Complete idiot's guide to creating HTML webpage
http://www.parsian.net/set1252/pages/books.htm

34
Computer graphics CMSC 427/Mount, David
www.oopweb.com

35
Configuring and troubleshooting the windows NT/95 registry
http://www.parsian.net/set1252/pages/books.htm

36
Creating commercial websites
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

37
Creating web applets with Java
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

38
Crystal Reports.NET
http://www.crystalreportsbook.com/Chapters.asp

39
Curious about the internet
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

40
Curious about the internet?
http://www.parsian.net/set1252/pages/books.htm

41
Dan appleman's developing activeX components with Visual Basic 5
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

42
Dan appleman's developing activex components with Visual Basic 5.0
http://www.parsian.net/set1252/pages/books.htm

43
Data structures CMSC420/Mount, David
www.oopweb.com

44
Database developer's guide with visual basic 4, 2nd.ed.
http://www.parsian.net/set1252/pages/books.htm

45
Database developer's guide with Visual Basic 4, 2nd.ed.
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

46
Database developer's guide with Visual C++ 4, 2nd.ed.
http://www.parsian.net/set1252/pages/books.htm

47
Database developer's guide with Visual C++ 4, 2nd.ed.
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

48
Design and analysis of computer algorithms CMSC451/Mount, David
www.oopweb.com

49
Designing implementing Microsoft internet information server
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

50
Designing implementing Microsoft proxy server
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

51
Developing for netscape one
http://www.parsian.net/set1252/pages/books.htm

52
Developing intranet applications with java
http://www.parsian.net/set1252/pages/books.htm

53
Developing personal oracle 7 for windows 95 applications
http://www.parsian.net/set1252/pages/books.htm

54
Developing personal Oracle 7 for windows 95 applications
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

55
Developing professional java applets
http://www.parsian.net/set1252/pages/books.htm

56
Developing professional java applets
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

57
DNS and BIND
http://www.hk8.org/old_web/

58
Doing objects with VB.NET and C#
http://vbwire.com/nl?6814

59
EAI/BPM Evaluation Series: IBM WebSphere MQ Workflow v3.3.2 & EAI Suite by
> Middleware Technology Evaluation Series, Phong Tran & Jeffrey Gosper
http://www.cmis.csiro.au/mte/reports/BPM_IBMwebsphereMQ332.htm

60
Effective AWK programming
http://book.onairweb.net/computer/os/shell/Effective_AWK_Programming/

61
Enterprise javabeans, 2nd.ed.
http://www.hk8.org/old_web/

62
Exploring java
http://www.hk8.org/old_web/

63
GNOME/Sheets, John
www.oopweb.com

64
Graph theory/Prof. Even
www.oopweb.com

65
Hacking java
http://www.parsian.net/set1252/pages/books.htm

66
How intranets work
http://www.parsian.net/set1252/pages/books.htm

67
How intranets work
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

68
How to program visual basic 5.0
http://www.parsian.net/set1252/pages/books.htm

69
How to use HTML 3.2
http://www.parsian.net/set1252/pages/books.htm

70
Html : The definitive guide
http://www.hk8.org/old_web/

71
HTML 3.2 & CGI unleashed
http://www.parsian.net/set1252/pages/books.htm

72
HTML 3.2 and CGI professional reference edition unleashed
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

73
HTML by example
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

74
Internet firewall
http://www.hk8.org/old_web/

75
Intranets unleashed
http://www.parsian.net/set1252/pages/books.htm

76
Introduction to object-oriented programming using C++/Muller, Peter
www.oopweb.com

77
Introduction to programming using Java/Eck, David
www.oopweb.com

78
Introduction to socket programming
http://book.onairweb.net/computer/network/An_Introduction_to_Socket_Programming/

79
Java 1.1 unleashed
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

80
Java 1.1 unleashed, 2nd.ed.
http://www.parsian.net/set1252/pages/books.htm

81
Java 1.1 unleashed, 3rd.ed.
http://www.parsian.net/set1252/pages/books.htm

82
Java 114 documentation
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

83
Java AWT reference
http://www.hk8.org/old_web/

84
Java by example
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

85
Java developer's guide
http://www.parsian.net/set1252/pages/books.htm

86
Java developer's guide
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

87
Java developer's reference
http://www.parsian.net/set1252/pages/books.htm

88
Java developer's reference
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

89
Java Distributed computing
http://www.hk8.org/old_web/

90
Java enterprise
http://www.hk8.org/old_web/

91
Java enterprise in a nutshell
http://www.hk8.org/old_web/

92
Java foundation classes in a nutshell
http://www.hk8.org/old_web/

93
Java fundamental classes reference
http://www.hk8.org/old_web/

94
Java in a nutshell
http://www.hk8.org/old_web/

95
Java in a nutshell, 3rd.ed.
http://www.hk8.org/old_web/

96
Java language reference
http://www.hk8.org/old_web/

97
Java security
http://www.hk8.org/old_web/

98
Java servlet programming
http://www.hk8.org/old_web/

99
Java unleashed
http://www.parsian.net/set1252/pages/books.htm

100
Java unleashed
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

101
Java, 2nd.ed.
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

102
_JavaScript : the definitive guide
http://www.hk8.org/old_web/

103
_Javascript manual of style
http://www.parsian.net/set1252/pages/books.htm

104
_Javascript manual of style
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

105
Josh's GNU Linux Guide/Joshua
http://book.onairweb.net/computer/os/linux/Administration/Josh's_GNU_Linux_Guide/

106
Late night activex
http://www.parsian.net/set1252/pages/books.htm

107
Late night activeX
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

108
Laura lemay's 3D graphics in and VRML 2
http://www.parsian.net/set1252/pages/books.htm

109
Laura lemay's activex and _VBScript
http://www.parsian.net/set1252/pages/books.htm

110
Laura lemay's graphics and web page design
http://www.parsian.net/set1252/pages/books.htm

111
Laura lemay's guide to sizzling websites design
http://www.parsian.net/set1252/pages/books.htm

112
Laura lemay's _javascript 1.1
http://www.parsian.net/set1252/pages/books.htm

113
Laura lemay's web workshop activex and _VBScript
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

114
Laura lemay's web workshop Graphics web page design
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

115
Laura lemay's web workshop _javascript
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

116
Learning perl
http://www.hk8.org/old_web/

117
Learning perl on win32
http://www.hk8.org/old_web/

118
Learning the kornshell
http://www.hk8.org/old_web/

119
Learning unix
http://www.hk8.org/old_web/

120
Learning vi
http://www.hk8.org/old_web/

121
Linux from Scratch/Beekmans, Gerard
http://book.onairweb.net/computer/os/linux/Administration/Linux_From_Scratch/

122
Linux in a nutshell, 3rd.ed.
http://www.hk8.org/old_web/

123
Linux kernel/Rusling, David
www.oopweb.com

124
Linux network administrator's guide/Dawson, Terry
www.oopweb.com

125
Linux system administrator's survival guide
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

126
MAPI, SAPI and TAPI developer's guide
http://www.parsian.net/set1252/pages/books.htm

127
Mastering access 95 development
http://www.parsian.net/set1252/pages/books.htm

128
Microsoft access 97 quick reference
http://www.parsian.net/set1252/pages/books.htm

129
Microsoft access 97 quick reference
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

130
Microsoft backoffice 2 unleashed
http://www.parsian.net/set1252/pages/books.htm

131
Microsoft excel 97 quick reference
http://www.parsian.net/set1252/pages/books.htm

132
Microsoft excel 97 quick reference
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

133
Microsoft exchange server survival guide
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

134
Microsoft frontpage unleashed
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

135
Microsoft word 97 quick reference
http://www.parsian.net/set1252/pages/books.htm

136
Microsoft word 97 quick reference
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

137
Microsoft works 4.5 6-In-1
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

138
More than 100 full-text e-books
http://www.allfreetech.com/EBookCategory.asp

139
Ms backoffice administrator's survival guide
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

140
Ms backoffice unleashed
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

141
Mysql and msql
http://www.hk8.org/old_web/

142
Netscape plug-ins developer's kit
http://www.parsian.net/set1252/pages/books.htm

143
Official gamelan java directory
http://www.parsian.net/set1252/pages/books.htm

144
Oracle built-in packages
http://www.hk8.org/old_web/

145
Oracle PL/SQL built-in pocket reference
http://www.hk8.org/old_web/

146
Oracle PL/SQL language pocket reference
http://www.hk8.org/old_web/

147
Oracle PL/SQL programming guide to Oracle 8 features
http://www.hk8.org/old_web/

148
Oracle PL/SQL programming, 2nd.ed.
http://www.hk8.org/old_web/

149
Oracle unleashed
http://www.parsian.net/set1252/pages/books.htm

150
Oracle unleashed
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

151
Oracle web applications PL/SQL developer's introduction
http://www.hk8.org/old_web/

152
Patterns of enterprise application architecture/Fowler, Martin
http://www.awprofessional.com/catalog/product.asp?product_id={574D77DF-6ED2-BC5-A6A8-02E59CA7482D}

153
PC week : the intranet advantage
http://www.parsian.net/set1252/pages/books.htm

154
Perl 5 by example
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

155
Perl 5 quick reference
http://www.parsian.net/set1252/pages/books.htm

156
Perl 5 unleashed
http://www.parsian.net/set1252/pages/books.htm

157
Perl 5.0 CGI web pages
http://www.parsian.net/set1252/pages/books.htm

158
Perl cookbook
http://www.hk8.org/old_web/

159
Perl for system administration
http://www.hk8.org/old_web/

160
Perl in a nutshell
http://www.hk8.org/old_web/

161
Perl quick reference
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

162
Peter norton's complete guide to windows NT 4 workstations
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

163
Presenting activex
http://www.parsian.net/set1252/pages/books.htm

164
Presenting activex
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

165
Presenting javabeans
http://www.parsian.net/set1252/pages/books.htm

166
Presenting javabeans
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

167
Programming perl
http://www.hk8.org/old_web/

168
Programming perl, 3rd.ed.
http://www.hk8.org/old_web/

169
Programming the Perl DBI
http://www.hk8.org/old_web/

170
Red hat linux unleashed
http://www.parsian.net/set1252/pages/books.htm

171
Running a perfect intranet
http://www.parsian.net/set1252/pages/books.htm

172
Running Linux, 3rd.ed.
http://www.hk8.org/old_web/

173
Sams teach yourself java 1.1 in 24 hours/
http://book.onairweb.net/computer/sams/Sams_Teach_Yourself_Java_1.1_Programming_in_24_Hours

174
Sams Teach yourself java in 21 days/Lemay, Laura
http://book.onairweb.net/computer/sams/Sams_Teach_Yourself_Java_in_21_Days/

175
Sams teach yourself linux in 24 hours/Ball, Bill
http://book.onairweb.net/computer/sams/Sams_Teach_Yourself_Linux_in_24%20Hours/

176
Sams teach yourself shell programming in 24 hours
http://book.onairweb.net/computer/sams/Sams_Teach_Yourself_Shell_Programming_in_24_Hours/

177
Sams teach yourself TCP/IP in 14 days
http://book.onairweb.net/computer/sams/Sams_Teach_Yourself_TCP-IP_in_14_Days(SE)/

178
Sed and awk
http://www.hk8.org/old_web/

179
Sendmail
http://www.hk8.org/old_web/

180
Sendmail desktop reference
http://www.hk8.org/old_web/

181
Slackware linux unleashed
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

182
Special edition using java, 2nd.ed.
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

183
Special edition using _javascript
http://www.parsian.net/set1252/pages/books.htm

184
Special edition using _javascript
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

185
Special edition using _Jscript
http://www.parsian.net/set1252/pages/books.htm

186
Special edition using lotus notes and domino 4.5
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

187
Special edition using Microsoft SQL server 6.5, 2nd.ed.
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

188
Special edition using Microsoft visual Interdev
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

189
Special edition using perl 5 for web programming
http://www.parsian.net/set1252/pages/books.htm

190
Special edition using perl for web programming
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

191
Special edition using Visual Basic 4
http://www.parsian.net/set1252/pages/books.htm

192
TCP/IP
http://www.hk8.org/old_web/

193
Teach yourself activex programming in 21 days
http://www.parsian.net/set1252/pages/books.htm

194
Teach yourself C++ in 21 days
http://www.parsian.net/set1252/pages/books.htm

195
Teach yourself C++ in 21 days
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

196
Teach yourself CGI programming with Perl 5 in a week
http://www.parsian.net/set1252/pages/books.htm

197
Teach yourself database programming with VB5 in 21 days, 2nd.ed.
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

198
Teach yourself database programming with visual basic 5 in 21 days
http://www.parsian.net/set1252/pages/books.htm

199
Teach yourself HTML 3.2 in 24 hours
http://www.parsian.net/set1252/pages/books.htm

200
Teach yourself HTML 3.2 in 24 hours
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

201
Teach yourself internet game programming with java in 21 days
http://www.parsian.net/set1252/pages/books.htm

202
Teach yourself java 1.1 programming in 24 hours
http://www.parsian.net/set1252/pages/books.htm

203
Teach yourself jave in café in 21 days
http://www.parsian.net/set1252/pages/books.tm

204
Teach yourself Microsoft visual Interdev in 21 days
http://www.parsian.net/set1252/pages/books.htm

205
Teach yourself Microsoft visual Interdev in 21 days
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

206
Teach yourself oracle 8 in 21 days
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

207
Teach yourself perl 5 in 21 days
http://www.parsian.net/set1252/pages/books.htm

208
Teach yourself perl 5 in 21 days, 2nd.ed.
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

209
Teach yourself SQL in 21 days
http://www.parsian.net/set1252/pages/books.htm

210
Teach yourself SQL in 21 days, 2nd.ed.
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

211
Teach yourself TCP/IP in 14 days
http://www.parsian.net/set1252/pages/books.htm

212
Teach yourself TCP/IP in 14 days, 2nd.ed.
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

213
Teach yourself the Internet in 24 hours
http://www.parsian.net/set1252/pages/books.htm

214
Teach yourself the internet in 24 hours
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

215
Teach yourself _VBScript in 21 days
http://www.parsian.net/set1252/pages/books.htm

216
Teach yourself _VBScript in 21 days
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

217
Teach yourself visual basic 5 in 24 hours
http://www.parsian.net/set1252/pages/books.htm

218
Teach yourself Visual Basic 5 in 24 hours
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

219
Teach yourself Visual J++ in 21 days
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

220
Teach yourself web publishing with HTML 3.2 in 14 days
http://www.parsian.net/set1252/pages/books.htm

221
Teach yourself web publishing with HTML in 14 days
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

222
Thinking in C++
http://www.mindview.net/Books

223
Thinking in C++/Eckel, Bruce - Vol.I, 2nd.ed.
www.oopweb.com

224
Thinking in C++/Eckel, Bruce - Vol.II, 2nd.ed.
www.oopweb.com

225
Thinking in Enterprise Java
http://www.mindview.net/Books

226
Thinking in Java, 2nd.ed.
www.oopweb.com

227
Thinking in Java, 3rd.ed. (pdf)
http://www.mindview.net/Books

228
Tricks of the internet gurus
http://www.parsian.net/set1252/pages/books.htm

229
Tricks of the java programming gurus
http://www.parsian.net/set1252/pages/books.htm

230
Unix and internet security
http://www.hk8.org/old_web/

231
Unix hints and hacks/Waingrow, Kirk
http://book.onairweb.net/computer/os/unix/Administration/UNIX_Hints_&_Hacks/19270001..htm

232
Unix in a nutshell
http://www.hk8.org/old_web/

233
Unix kornshell quick reference
http://book.onairweb.net/computer/os/shell/Unix_KornShell_Quick_Reference/kornShell.html

234
Unix power tools
http://www.hk8.org/old_web/

235
Unix shell guide
http://book.onairweb.net/computer/os/shell/The_UNIX_Shell_Guide/

236
Unix unleashed
http://www.parsian.net/set1252/pages/books.htm

237
Unix unleashed
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

238
Unix unleashed Internet Ed./Burk, Robin
http://book.onairweb.net/computer/os/unix/Administration/UNIX_Unleashed(Internet_Edition)/fm.htm

239
Unix unleashed, System administrator's Edition
http://book.onairweb.net/computer/os/unix/Administration/UNIX_Unleashed_System_Administrator's_Edition/toc.htm

240
Unix Unleashed/Sams Publication
http://book.onairweb.net/computer/os/unix/Administration/UNIX_Unleashed/

241
Upgrading PCs illustrated
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

242
Using windows NT workstation 4.0
http://www.parsian.net/set1252/pages/books.htm

243
_VBScript unleashed
http://www.parsian.net/set1252/pages/books.htm

244
_Vbscript unleashed
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

245
Visual basic 4 in 12 easy lessons
http://www.parsian.net/set1252/pages/books.htm

246
Visual basic 4 unleashed
http://www.parsian.net/set1252/pages/books.htm

247
Visual Basic 5 night school
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

248
Visual basic programming in 12 easy lessons
http://www.parsian.net/set1252/pages/books.htm

249
Visual Basic programming in 12 easy lessons
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

250
Visual C++ 4 unleashed
http://www.parsian.net/set1252/pages/books.htm

251
Visual C++ programming in 12 easy lessons
http://www.parsian.net/set1252/pages/books.htm

252
Web database developer's guide with visual basic 5
http://www.parsian.net/set1252/pages/books.htm

253
Web database developer's guide with visual basic 5
http://www.emu.edu.tr/english/facilitiesservices/computercenter/bookslib/

254
Web programming desktop reference 6-in-1
http://www.parsian.net/set1252/pages/books.htm

Internet

noreply@blogger.com (M.S.BINDRA) — Thu, 12 Jun 2008 12:37:00 +0000

The Internet is a computer network made up of thousands of networks worldwide. No one knows exactly how many computers are connected to the Internet. It is certain, however, that these number in the millions.

No one is in charge of the Internet. There are organizations which develop technical aspects of this network and set standards for creating applications on it, but no governing body is in control. The Internet backbone, through which Internet traffic flows, is owned by private companies.

All computers on the Internet communicate with one another using the Transmission Control Protocol/Internet Protocol suite, abbreviated to TCP/IP. Computers on the Internet use a client/server architecture. This means that the remote server machine provides files and services to the user's local client machine. Software can be installed on a client computer to take advantage of the latest access technology.

An Internet user has access to a wide variety of services: electronic mail, file transfer, vast information resources, interest group membership, interactive collaboration, multimedia displays, real-time broadcasting, shopping opportunities, breaking news, and much more.

The Internet consists primarily of a variety of access protocols. Many of these protocols feature programs that allow users to search for and retrieve material made available by the protocol.

COMPONENTS OF THE INTERNET

WORLD WIDE WEB
The World Wide Web (abbreviated as the Web or WWW) is a system of Internet servers that supports hypertext to access several Internet protocols on a single interface. Almost every protocol type available on the Internet is accessible on the Web. This includes e-mail, FTP, Telnet, and Usenet News. In addition to these, the World Wide Web has its own protocol: HyperText Transfer Protocol, or HTTP. These protocols will be explained later in this document.

The World Wide Web provides a single interface for accessing all these protocols. This creates a convenient and user-friendly environment. It is no longer necessary to be conversant in these protocols within separate, command-level environments. The Web gathers together these protocols into a single system. Because of this feature, and because of the Web's ability to work with multimedia and advanced programming languages, the Web is the fastest-growing component of the Internet.

The operation of the Web relies primarily on hypertext as its means of information retrieval. HyperText is a document containing words that connect to other documents. These words are called links and are selectable by the user. A single hypertext document can contain links to many documents. In the context of the Web, words or graphics may serve as links to other documents, images, video, and sound. Links may or may not follow a logical path, as each connection is programmed by the creator of the source document. Overall, the Web contains a complex virtual web of connections among a vast number of documents, graphics, videos, and sounds.

Producing hypertext for the Web is accomplished by creating documents with a language called HyperText Markup Language, or HTML. With HTML, tags are placed within the text to accomplish document formatting, visual features such as font size, italics and bold, and the creation of hypertext links. Graphics and multimedia may also be incorporated into an HTML document. HTML is an evolving language, with new tags being added as each upgrade of the language is developed and released. The World Wide Web Consortium (W3C), led by Web founder Tim Berners-Lee, coordinates the efforts of standardizing HTML. The W3C now calls the language XHTML and considers it to be an application of the XML language standard.

The World Wide Web consists of files, called pages or home pages, containing links to documents and resources throughout the Internet.

The Web provides a vast array of experiences including multimedia presentations, real-time collaboration, interactive pages, radio and television broadcasts, and the automatic "push" of information to a client computer. Programming languages such as Java, JavaScript, Visual Basic, Cold Fusion and XML are extending the capabilities of the Web. A growing amount of information on the Web is served dynamically from content stored in databases. The Web is therefore not a fixed entity, but one that is in a constant state of development and flux.

For more complete information about the World Wide Web, see Understanding The World Wide Web.

E-MAIL
Electronic mail, or e-mail, allows computer users locally and worldwide to exchange messages. Each user of e-mail has a mailbox address to which messages are sent. Messages sent through e-mail can arrive within a matter of seconds.

A powerful aspect of e-mail is the option to send electronic files to a person's e-mail address. Non-ASCII files, known as binary files, may be attached to e-mail messages. These files are referred to as MIME attachments.MIME stands for Multimedia Internet Mail Extension, and was developed to help e-mail software handle a variety of file types. For example, a document created in Microsoft Word can be attached to an e-mail message and retrieved by the recipient with the appropriate e-mail program. Many e-mail programs, including Eudora, Netscape Messenger, and Microsoft Outlook, offer the ability to read files written in HTML, which is itself a MIME type.

TELNET
Telnet is a program that allows you to log into computers on the Internet and use online databases, library catalogs, chat services, and more. There are no graphics in Telnet sessions, just text. To Telnet to a computer, you must know its address. This can consist of words (locis.loc.gov) or numbers (140.147.254.3). Some services require you to connect to a specific port on the remote computer. In this case, type the port number after the Internet address. Example: telnet nri.reston.va.us 185.

Telnet is available on the World Wide Web. Probably the most common Web-based resources available through Telnet have been library catalogs, though most catalogs have since migrated to the Web. A link to a Telnet resource may look like any other link, but it will launch a Telnet session to make the connection. A Telnet program must be installed on your local computer and configured to your Web browser in order to work.

With the increasing popularity of the Web, Telnet has become less frequently used as a means of access to information on the Internet.

FTP
FTP stands for File Transfer Protocol. This is both a program and the method used to transfer files between computers. Anonymous FTP is an option that allows users to transfer files from thousands of host computers on the Internet to their personal computer account. FTP sites contain books, articles, software, games, images, sounds, multimedia, course work, data sets, and more.

If your computer is directly connected to the Internet via an Ethernet cable, you can use one of several PC software programs, such as WS_FTP for Windows, to conduct a file transfer.

FTP transfers can be performed on the World Wide Web without the need for special software. In this case, the Web browser will suffice. Whenever you download software from a Web site to your local machine, you are using FTP. You can also retrieve FTP files via search engines such as FtpFind, located at /http://www.ftpfind.com/. This option is easiest because you do not need to know FTP program commands.

E-MAIL DISCUSSION GROUPS
One of the benefits of the Internet is the opportunity it offers to people worldwide to communicate via e-mail. The Internet is home to a large community of individuals who carry out active discussions organized around topic-oriented forums distributed by e-mail. These are administered by software programs. Probably the most common program is the listserv.

A great variety of topics are covered by listservs, many of them academic in nature. When you subscribe to a listserv, messages from other subscribers are automatically sent to your electronic mailbox. You subscribe to a listserv by sending an e-mail message to a computer program called a listserver. Listservers are located on computer networks throughout the world. This program handles subscription information and distributes messages to and from subscribers. You must have a e-mail account to participate in a listserv discussion group. Visit Tile.net at /http://tile.net/ to see an example of a site that offers a searchablecollection of e-mail discussion groups.

Majordomo and Listproc are two other programs that administer e-mail discussion groups. The commands for subscribing to and managing your list memberships are similar to those of listserv.

USENET NEWS
Usenet News is a global electronic bulletin board system in which millions of computer users exchange information on a vast range of topics. The major difference between Usenet News and e-mail discussion groups is the fact that Usenet messages are stored on central computers, and users must connect to these computers to read or download the messages posted to these groups. This is distinct from e-mail distribution, in which messages arrive in the electronic mailboxes of each list member.

Usenet itself is a set of machines that exchanges messages, or articles, from Usenet discussion forums, called newsgroups. Usenet administrators control their own sites, and decide which (if any) newsgroups to sponsor and which remote newsgroups to allow into the system.

There are thousands of Usenet newsgroups in existence. While many are academic in nature, numerous newsgroups are organized around recreational topics. Much serious computer-related work takes place in Usenet discussions. A small number of e-mail discussion groups also exist as Usenet newsgroups.

The Usenet newsfeed can be read by a variety of newsreader software programs. For example, the Netscape suite comes with a newsreader program called Messenger. Newsreaders are also available as standalone products.

FAQ, RFC, FYI
FAQ stands for Frequently Asked Questions. These are periodic postings to Usenet newsgroups that contain a wealth of information related to the topic of the newsgroup. Many FAQs are quite extensive. FAQs are available by subscribing to individual Usenet newsgroups. A Web-based collection of FAQ resources has been collected by The Internet FAQ Consortium and is available at /http://www.faqs.org/.

RFC stands for Request for Comments. These are documents created by and distributed to the Internet community to help define the nuts and bolts of the Internet. They contain both technical specifications and general information.

FYI stands for For Your Information. These notes are a subset of RFCs and contain information of interest to new Internet users.

Links to indexes of all three of these information resources are available on the University Libraries Web site at /http://library.albany.edu/reference/faqs.html.

CHAT & INSTANT MESSENGING
Chat programs allow users on the Internet to communicate with each other by typing in real time. They are sometimes included as a feature of a Web site, where users can log into the "chat room" to exchange comments and information about the topics addressed on the site. Chat may take other, more wide-ranging forms. For example, America Online is well known for sponsoring a number of topical chat rooms.

Internet Relay Chat (IRC) is a service through which participants can communicate to each other on hundreds of channels. These channels are usually based on specific topics. While many topics are frivolous, substantive conversations are also taking place. To access IRC, you must use an IRC software program.

A variation of chat is the phenomenon of instant messenging. With instant messenging, a user on the Web can contact another user currently logged in and type a conversation. Most famous is America Online's Instant Messenger. ICQ, MSN and Yahoo are other commonly-used chat programs.

Other types of real-time communication are addressed in the tutorial Understanding the World Wide Web.

MUD/MUSH/MOO/MUCK/DUM/MUSE
MUD stands for Multi User Dimension. MUDs, and their variations listed above, are multi-user virtual reality games based on simulated worlds. Traditionally text based, graphical MUDs now exist. There are MUDs of all kinds on the Internet, and many can be joined free of charge. For more information, read one of the FAQs devoted to MUDs available at the FAQ site at

Intel® Atom™ processor

noreply@blogger.com (M.S.BINDRA) — Mon, 09 Jun 2008 14:59:00 +0000

Intel's smallest chip.This is smallest processor built with the world’s smallest transistors. The Intel® Atom™ processor is based on an entirely new design, built for low power and designed specifically for a new wave of Mobile Internet Devices and simple, low-cost PC’s. This small wonder is a fundamental new shift in design, small yet powerful enough to enable a big Internet experience on these new devices.

Core Networking

noreply@blogger.com (M.S.BINDRA) — Mon, 09 Jun 2008 14:33:00 +0000

Major Laptop Producers

noreply@blogger.com (M.S.BINDRA) — Thu, 05 Jun 2008 14:19:00 +0000

10 Fast and Free Security Enhancements

noreply@blogger.com (M.S.BINDRA) — Thu, 22 May 2008 12:26:00 +0000

Before you spend a dime on security, there are many precautions you can take that will protect you against the most common threats.

1. Check Windows Update and Office Update regularly (_http://office.microsoft.com/productupdates); have your Office CD ready. Windows Me, 2000, and XP users can configure automatic updates. Click on the Automatic Updates tab in the System control panel and choose the appropriate options.

2. Install a personal firewall. Both SyGate (_www.sygate.com) and ZoneAlarm (_www.zonelabs.com) offer free versions.

3. Install a free spyware blocker. Our Editors' Choice ("Spyware," April 22) was SpyBot Search & Destroy (_http://security.kolla.de). SpyBot is also paranoid and ruthless in hunting out tracking cookies.

4. Block pop-up spam messages in Windows NT, 2000, or XP by disabling the Windows Messenger service (this is unrelated to the instant messaging program). Open Control Panel | Administrative Tools | Services and you'll see Messenger. Right-click and go to Properties. Set Start-up Type to Disabled and press the Stop button. Bye-bye, spam pop-ups! Any good firewall will also stop them.

5. Use strong passwords and change them periodically. Passwords should have at least seven characters; use letters and numbers and have at least one symbol. A decent example would be f8izKro@l. This will make it much harder for anyone to gain access to your accounts.

6. If you're using Outlook or Outlook Express, use the current version or one with the Outlook Security Update installed. The update and current versions patch numerous vulnerabilities.

7. Buy antivirus software and keep it up to date. If you're not willing to pay, try Grisoft AVG Free Edition (Grisoft Inc., w*w.grisoft.com). And doublecheck your AV with the free, online-only scanners available at w*w.pandasoftware.com/activescan and _http://housecall.trendmicro.com.

8. If you have a wireless network, turn on the security features: Use MAC filtering, turn off SSID broadcast, and even use WEP with the biggest key you can get. For more, check out our wireless section or see the expanded coverage in Your Unwired World in our next issue.

9. Join a respectable e-mail security list, such as the one found at our own Security Supersite at _http://security.ziffdavis.com, so that you learn about emerging threats quickly and can take proper precautions.

10. Be skeptical of things on the Internet. Don't assume that e-mail "From:" a particular person is actually from that person until you have further reason to believe it's that person. Don't assume that an attachment is what it says it is. Don't give out your password to anyone, even if that person claims to be from "support."

10 reasons why PCs crash

noreply@blogger.com (M.S.BINDRA) — Thu, 22 May 2008 11:14:00 +0000

Fatal error: The system has become unstable or is busy," it says. "Enter to return to Windows or press Control-Alt-Delete to restart your computer. If you do this you will lose any unsaved information in all open applications."

You have just been struck by the Blue Screen of Death. Anyone who uses Mcft Windows will be familiar with this. What can you do? More importantly, how can you prevent it happening?

1 Hardware conflict

The number one reason why Windows crashes is hardware conflict. Each hardware device communicates to other devices through an interrupt request channel (IRQ). These are supposed to be unique for each device.

For example, a printer usually connects internally on IRQ 7. The keyboard usually uses IRQ 1 and the floppy disk drive IRQ 6. Each device will try to hog a single IRQ for itself.

If there are a lot of devices, or if they are not installed properly, two of them may end up sharing the same IRQ number. When the user tries to use both devices at the same time, a crash can happen. The way to check if your computer has a hardware conflict is through the following route:

* Start-Settings-Control Panel-System-Device Manager.

Often if a device has a problem a yellow '!' appears next to its description in the Device Manager. Highlight Computer (in the Device Manager) and press Properties to see the IRQ numbers used by your computer. If the IRQ number appears twice, two devices may be using it.

Sometimes a device might share an IRQ with something described as 'IRQ holder for PCI steering'. This can be ignored. The best way to fix this problem is to remove the problem device and reinstall it.

Sometimes you may have to find more recent drivers on the internet to make the device function properly. A good resource is www.driverguide.com. If the device is a soundcard, or a modem, it can often be fixed by moving it to a different slot on the motherboard (be careful about opening your computer, as you may void the warranty).

When working inside a computer you should switch it off, unplug the mains lead and touch an unpainted metal surface to discharge any static electricity.

To be fair to Mcft, the problem with IRQ numbers is not of its making. It is a legacy problem going back to the first PC designs using the IBM 8086 chip. Initially there were only eight IRQs. Today there are 16 IRQs in a PC. It is easy to run out of them. There are plans to increase the number of IRQs in future designs.

2 Bad Ram

Ram (random-access memory) problems might bring on the blue screen of death with a message saying Fatal Exception Error. A fatal error indicates a serious hardware problem. Sometimes it may mean a part is damaged and will need replacing.

But a fatal error caused by Ram might be caused by a mismatch of chips. For example, mixing 70-nanosecond (70ns) Ram with 60ns Ram will usually force the computer to run all the Ram at the slower speed. This will often crash the machine if the Ram is overworked.

One way around this problem is to enter the BIOS settings and increase the wait state of the Ram. This can make it more stable. Another way to troubleshoot a suspected Ram problem is to rearrange the Ram chips on the motherboard, or take some of them out. Then try to repeat the circumstances that caused the crash. When handling Ram try not to touch the gold connections, as they can be easily damaged.

Parity error messages also refer to Ram. Modern Ram chips are either parity (ECC) or non parity (non-ECC). It is best not to mix the two types, as this can be a cause of trouble.

EMM386 error messages refer to memory problems but may not be connected to bad Ram. This may be due to free memory problems often linked to old Dos-based programmes.

3 BIOS settings

Every motherboard is supplied with a range of chipset settings that are decided in the factory. A common way to access these settings is to press the F2 or delete button during the first few seconds of a boot-up.

Once inside the BIOS, great care should be taken. It is a good idea to write down on a piece of paper all the settings that appear on the screen. That way, if you change something and the computer becomes more unstable, you will know what settings to revert to.

A common BIOS error concerns the CAS latency. This refers to the Ram. Older EDO (extended data out) Ram has a CAS latency of 3. Newer SDRam has a CAS latency of 2. Setting the wrong figure can cause the Ram to lock up and freeze the computer's display.

Mcft Windows is better at allocating IRQ numbers than any BIOS. If possible set the IRQ numbers to Auto in the BIOS. This will allow Windows to allocate the IRQ numbers (make sure the BIOS setting for Plug and Play OS is switched to 'yes' to allow Windows to do this.).

4 Hard disk drives

After a few weeks, the information on a hard disk drive starts to become piecemeal or fragmented. It is a good idea to defragment the hard disk every week or so, to prevent the disk from causing a screen freeze. Go to

* Start-Programs-Accessories-System Tools-Disk Defragmenter

This will start the procedure. You will be unable to write data to the hard drive (to save it) while the disk is defragmenting, so it is a good idea to schedule the procedure for a period of inactivity using the Task Scheduler.

The Task Scheduler should be one of the small icons on the bottom right of the Windows opening page (the desktop).

Some lockups and screen freezes caused by hard disk problems can be solved by reducing the read-ahead optimisation. This can be adjusted by going to

* Start-Settings-Control Panel-System Icon-Performance-File System-Hard Disk.

Hard disks will slow down and crash if they are too full. Do some housekeeping on your hard drive every few months and free some space on it. Open the Windows folder on the C drive and find the Temporary Internet Files folder. Deleting the contents (not the folder) can free a lot of space.

Empty the Recycle Bin every week to free more space. Hard disk drives should be scanned every week for errors or bad sectors. Go to

* Start-Programs-Accessories-System Tools-ScanDisk

Otherwise assign the Task Scheduler to perform this operation at night when the computer is not in use.

5 Fatal OE exceptions and VXD errors

Fatal OE exception errors and VXD errors are often caused by video card problems.

These can often be resolved easily by reducing the resolution of the video display. Go to

* Start-Settings-Control Panel-Display-Settings

Here you should slide the screen area bar to the left. Take a look at the colour settings on the left of that window. For most desktops, high colour 16-bit depth is adequate.

If the screen freezes or you experience system lockups it might be due to the video card. Make sure it does not have a hardware conflict. Go to

* Start-Settings-Control Panel-System-Device Manager

Here, select the + beside Display Adapter. A line of text describing your video card should appear. Select it (make it blue) and press properties. Then select Resources and select each line in the window. Look for a message that says No Conflicts.

If you have video card hardware conflict, you will see it here. Be careful at this point and make a note of everything you do in case you make things worse.

The way to resolve a hardware conflict is to uncheck the Use Automatic Settings box and hit the Change Settings button. You are searching for a setting that will display a No Conflicts message.

Another useful way to resolve video problems is to go to

* Start-Settings-Control Panel-System-Performance-Graphics

Here you should move the Hardware Acceleration slider to the left. As ever, the most common cause of problems relating to graphics cards is old or faulty drivers (a driver is a small piece of software used by a computer to communicate with a device).

Look up your video card's manufacturer on the internet and search for the most recent drivers for it.

6 Viruses

Often the first sign of a virus infection is instability. Some viruses erase the boot sector of a hard drive, making it impossible to start. This is why it is a good idea to create a Windows start-up disk. Go to

* Start-Settings-Control Panel-Add/Remove Programs

Here, look for the Start Up Disk tab. Virus protection requires constant vigilance.

A virus scanner requires a list of virus signatures in order to be able to identify viruses. These signatures are stored in a DAT file. DAT files should be updated weekly from the website of your antivirus software manufacturer.

An excellent antivirus programme is McAfee VirusScan by Network Associates ( www.nai.com). Another is Norton AntiVirus 2000, made by Symantec ( www.symantec.com).

7 Printers

The action of sending a document to print creates a bigger file, often called a postscript file.

Printers have only a small amount of memory, called a buffer. This can be easily overloaded. Printing a document also uses a considerable amount of CPU power. This will also slow down the computer's performance.

If the printer is trying to print unusual characters, these might not be recognised, and can crash the computer. Sometimes printers will not recover from a crash because of confusion in the buffer. A good way to clear the buffer is to unplug the printer for ten seconds. Booting up from a powerless state, also called a cold boot, will restore the printer's default settings and you may be able to carry on.

8 Software

A common cause of computer crash is faulty or badly-installed software. Often the problem can be cured by uninstalling the software and then reinstalling it. Use Norton Uninstall or Uninstall Shield to remove an application from your system properly. This will also remove references to the programme in the System Registry and leaves the way clear for a completely fresh copy.

The System Registry can be corrupted by old references to obsolete software that you thought was uninstalled. Use Reg Cleaner by Jouni Vuorio to clean up the System Registry and remove obsolete entries. It works on Windows 95, Windows 98, Windows 98 SE (Second Edition), Windows Millennium Edition (ME), NT4 and Windows 2000.

Read the instructions and use it carefully so you don't do permanent damage to the Registry. If the Registry is damaged you will have to reinstall your operating system. Reg Cleaner can be obtained from www.jv16.org

Often a Windows problem can be resolved by entering Safe Mode. This can be done during start-up. When you see the message "Starting Windows" press F4. This should take you into Safe Mode.

Safe Mode loads a minimum of drivers. It allows you to find and fix problems that prevent Windows from loading properly.

Sometimes installing Windows is difficult because of unsuitable BIOS settings. If you keep getting SUWIN error messages (Windows setup) during the Windows installation, then try entering the BIOS and disabling the CPU internal cache. Try to disable the Level 2 (L2) cache if that doesn't work.

Remember to restore all the BIOS settings back to their former settings following installation.

9 Overheating

Central processing units (CPUs) are usually equipped with fans to keep them cool. If the fan fails or if the CPU gets old it may start to overheat and generate a particular kind of error called a kernel error. This is a common problem in chips that have been overclocked to operate at higher speeds than they are supposed to.

One remedy is to get a bigger better fan and install it on top of the CPU. Specialist cooling fans/heatsinks are available from www.computernerd.com or www.coolit.com

CPU problems can often be fixed by disabling the CPU internal cache in the BIOS. This will make the machine run more slowly, but it should also be more stable.

10 Power supply problems

With all the new construction going on around the country the steady supply of electricity has become disrupted. A power surge or spike can crash a computer as easily as a power cut.

If this has become a nuisance for you then consider buying a uninterrupted power supply (UPS). This will give you a clean power supply when there is electricity, and it will give you a few minutes to perform a controlled shutdown in case of a power cut.

It is a good investment if your data are critical, because a power cut will cause any unsaved data to be lost.

COMMON FTP ERROR CODES

noreply@blogger.com (M.S.BINDRA) — Wed, 21 May 2008 20:18:00 +0000

110 Restart marker reply. In this case, the text is exact and not left to the particular implementation; it must read: MARK yyyy = mmmm where yyyy is User-process data stream marker, and mmmm server's equivalent marker (note the spaces between markers and "=").

120 Service ready in nnn minutes.

125 Data connection already open; transfer starting.

150 File status okay; about to open data connection.

200 Command okay.

202 Command not implemented, superfluous at this site.

211 System status, or system help reply.

212 Directory status.

213 File status.

214 Help message.On how to use the server or the meaning of a particular non-standard command. This reply is useful only to the human user.

215 NAME system type. Where NAME is an official system name from the list in the Assigned Numbers document.

220 Service ready for new user.

221 Service closing control connection.

225 Data connection open; no transfer in progress.

226 Closing data connection. Requested file action successful (for example, file transfer or file abort).

227 Entering Passive Mode (h1,h2,h3,h4,p1,p2).

230 User logged in, proceed. Logged out if appropriate.

250 Requested file action okay, completed.

257 "PATHNAME" created.

331 User name okay, need password.

332 Need account for login.

350 Requested file action pending further information

421 Service not available, closing control connection.This may be a reply to any command if the service knows it must shut down.

425 Can't open data connection.

426 Connection closed; transfer aborted.

450 Requested file action not taken.

451 Requested action aborted. Local error in processing.

452 Requested action not taken. Insufficient storage space in system.File unavailable (e.g., file busy).

500 Syntax error, command unrecognized. This may include errors such as command line too long.

501 Syntax error in parameters or arguments.

502 Command not implemented.

503 Bad sequence of commands.

504 Command not implemented for that parameter.

530 Not logged in.

532 Need account for storing files.

550 Requested action not taken. File unavailable (e.g., file not found, no access).

551 Requested action aborted. Page type unknown.

552 Requested file action aborted. Exceeded storage allocation (for current directory or dataset).

553 Requested action not taken. File name not allowed.

Intel invented the brain inside computer

noreply@blogger.com (M.S.BINDRA) — Sun, 18 May 2008 22:39:00 +0000

Computer Keyboard Shortcuts

noreply@blogger.com (M.S.BINDRA) — Fri, 16 May 2008 20:02:00 +0000

Getting used to using your keyboard exclusively and leaving your mouse behind will make you much more efficient at performing any task on any Windows system.

Windows key + R = Run menu

This is usually followed by:

cmd = Command Prompt
iexplore + "web address" = Internet Explorer
compmgmt.msc = Computer Management
dhcpmgmt.msc = DHCP Management
dnsmgmt.msc = DNS Management
services.msc = Services
eventvwr = Event Viewer
dsa.msc = Active Directory Users and Computers
dssite.msc = Active Directory Sites and Services
Windows key + E = Explorer

ALT + Tab = Switch between windows

ALT, Space, X = Maximize window

CTRL + Shift + Esc = Task Manager

Windows key + Break = System properties

Windows key + F = Search

Windows key + D = Hide/Display all windows

CTRL + C = copy

CTRL + X = cut

CTRL + V = paste

About the "Right-click" key next to the right Windows key on your keyboard. Using the arrows and that key can get just about anything done once you've opened up any program.

Keyboard Shortcuts

[Alt] and [Esc] Switch between running applications

[Alt] and letter Select menu item by underlined letter

[Ctrl] and [Esc] Open Program Menu

[Ctrl] and [F4] Close active document or group windows (does not work with some applications)

[Alt] and [F4] Quit active application or close current window

[Alt] and [-] Open Control menu for active document

Ctrl] Lft., Rt. arrow Move cursor forward or back one word

Ctrl] Up, Down arrow Move cursor forward or back one paragraph

[F1] Open Help for active application

Windows+M Minimize all open windows

Shift+Windows+M Undo minimize all open windows

Windows+F1 Open Windows Help

Windows+Tab Cycle through the Taskbar buttons

Windows+Break Open the System Properties dialog box

Acessability shortcuts

Right SHIFT for eight seconds........ Switch FilterKeys on and off.

Left ALT +left SHIFT +PRINT SCREEN....... Switch High Contrast on and off.

Left ALT +left SHIFT +NUM LOCK....... Switch MouseKeys on and off.

SHIFT....... five times Switch StickyKeys on and off.

NUM LOCK...... for five seconds Switch ToggleKeys on and off.

explorer shortcuts

END....... Display the bottom of the active window.

HOME....... Display the top of the active window.

NUM LOCK+ASTERISK....... on numeric keypad (*) Display all subfolders under the selected folder.

NUM LOCK+PLUS SIGN....... on numeric keypad (+) Display the contents of the selected folder.

NUM LOCK+MINUS SIGN....... on numeric keypad (-) Collapse the selected folder.

LEFT ARROW...... Collapse current selection if it's expanded, or select parent folder.

RIGHT ARROW....... Display current selection if it's collapsed, or select first subfolder.

Type the following commands in your Run Box (Windows Key + R) or Start Run

devmgmt.msc = Device Manager
msinfo32 = System Information
cleanmgr = Disk Cleanup
ntbackup = Backup or Restore Wizard (Windows Backup Utility)
mmc = Microsoft Management Console
excel = Microsoft Excel (If Installed)
msaccess = Microsoft Access (If Installed)
powerpnt = Microsoft PowerPoint (If Installed)
winword = Microsoft Word (If Installed)
frontpg = Microsoft FrontPage (If Installed)
notepad = Notepad
wordpad = WordPad
calc = Calculator
msmsgs = Windows Messenger
mspaint = Microsoft Paint
wmplayer = Windows Media Player
rstrui = System Restore
netscp6 = Netscape 6.x
netscp = Netscape 7.x
netscape = Netscape 4.x
waol = America Online
control = Opens the Control Panel
control printers = Opens the Printers Dialog

Internet browser

type in u're adress "google", then press [Right CTRL] and [Enter]
add www. and .com to word and go to it

For Windows XP:

Copy. CTRL+C
Cut. CTRL+X
Paste. CTRL+V
Undo. CTRL+Z
Delete. DELETE
Delete selected item permanently without placing the item in the Recycle Bin. SHIFT+DELETE
Copy selected item. CTRL while dragging an item
Create shortcut to selected item. CTRL+SHIFT while dragging an item
Rename selected item. F2
Move the insertion point to the beginning of the next word. CTRL+RIGHT ARROW
Move the insertion point to the beginning of the previous word. CTRL+LEFT ARROW
Move the insertion point to the beginning of the next paragraph. CTRL+DOWN ARROW
Move the insertion point to the beginning of the previous paragraph. CTRL+UP ARROW
Highlight a block of text. CTRL+SHIFT with any of the arrow keys
Select more than one item in a window or on the desktop, or select text within a document. SHIFT with any of the arrow keys
Select all. CTRL+A
Search for a file or folder. F3
View properties for the selected item. ALT+ENTER
Close the active item, or quit the active program. ALT+F4
Opens the shortcut menu for the active window. ALT+SPACEBAR
Close the active document in programs that allow you to have multiple documents open simultaneously. CTRL+F4
Switch between open items. ALT+TAB
Cycle through items in the order they were opened. ALT+ESC
Cycle through screen elements in a window or on the desktop. F6
Display the Address bar list in My Computer or Windows Explorer. F4
Display the shortcut menu for the selected item. SHIFT+F10
Display the System menu for the active window. ALT+SPACEBAR
Display the Start menu. CTRL+ESC
Display the corresponding menu. ALT+Underlined letter in a menu name
Carry out the corresponding command. Underlined letter in a command name on an open menu
Activate the menu bar in the active program. F10
Open the next menu to the right, or open a submenu. RIGHT ARROW
Open the next menu to the left, or close a submenu. LEFT ARROW
Refresh the active window. F5
View the folder one level up in My Computer or Windows Explorer. BACKSPACE
Cancel the current task. ESC
SHIFT when you insert a CD into the CD-ROM drive Prevent the CD from automatically playing.

Use these keyboard shortcuts for dialog boxes:

To Press
Move forward through tabs. CTRL+TAB
Move backward through tabs. CTRL+SHIFT+TAB
Move forward through options. TAB
Move backward through options. SHIFT+TAB
Carry out the corresponding command or select the corresponding option. ALT+Underlined letter
Carry out the command for the active option or button. ENTER
Select or clear the check box if the active option is a check box. SPACEBAR
Select a button if the active option is a group of option buttons. Arrow keys
Display Help. F1
Display the items in the active list. F4
Open a folder one level up if a folder is selected in the Save As or Open dialog box. BACKSPACE

If you have a Microsoft Natural Keyboard, or any other compatible keyboard that includes the Windows logo key and the Application key , you can use these keyboard shortcuts:

Display or hide the Start menu. WIN Key
Display the System Properties dialog box. WIN Key+BREAK
Show the desktop. WIN Key+D
Minimize all windows. WIN Key+M
Restores minimized windows. WIN Key+Shift+M
Open My Computer. WIN Key+E
Search for a file or folder. WIN Key+F
Search for computers. CTRL+WIN Key+F
Display Windows Help. WIN Key+F1
Lock your computer if you are connected to a network domain, or switch users if you are not connected to a network domain. WIN Key+ L
Open the Run dialog box. WIN Key+R
Open Utility Manager. WIN Key+U

Accessibility keyboard shortcuts:

Switch FilterKeys on and off. Right SHIFT for eight seconds
Switch High Contrast on and off. Left ALT+left SHIFT+PRINT SCREEN
Switch MouseKeys on and off. Left ALT +left SHIFT +NUM LOCK
Switch StickyKeys on and off. SHIFT five times
Switch ToggleKeys on and off. NUM LOCK for five seconds
Open Utility Manager. WIN Key+U

Shortcuts you can use with Windows Explorer:

Display the bottom of the active window. END
Display the top of the active window. HOME
Display all subfolders under the selected folder. NUM LOCK+ASTERISK on numeric keypad (*)
Display the contents of the selected folder. NUM LOCK+PLUS SIGN on numeric keypad (+)
Collapse the selected folder. NUM LOCK+MINUS SIGN on numeric keypad (-)
Collapse current selection if it's expanded, or select parent folder. LEFT ARROW
Display current selection if it's collapsed, or select first subfolder. RIGHT ARROW