Different Ways to Lock Windows XP

• via the keyboard

The easiest way to lock Windows XP is by simply pressing the Windows logo key and the letter L (for Lock) on a Microsoft Natural Keyboard or any other compatible keyboard that includes the Window key. Doing so will pop up the Unlock Computer Password box.

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• via a Shortcut.

If you don't have a keyboard with a Window key or simply don't like the keyboard method, then here's how you can make a desktop shortcut to lock your computer.

Right click an empty area of your desktop.
choose New/Shortcut
enter below line as the command line:

        rundll32.exe user32.dll, LockWorkStation

Click Next. Name the shortcut whatever you prefer and click Finish.
That's it.

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• via command line

Open the DOS Prompt or Command Prompt.
In Simple Way You can open can open it by Clicking on START –> RUN –> typing CMD.

 Type the Command line written below to lock your computer

      rundll32.exe User32.dll,LockWorkStation

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• via Batch file

Open Notepad

Copy and paste the Below Command line:

      rundll32.exe User32.dll,LockWorkStation

Then Save the file as "Lock.bat" (without quotes)