* LOCK WORKSTATION

You can lock your XP workstation with two clicks of the mouse.
Create a new shortcut on your desktop using a right mouse click,
and enter 'rundll32.exe user32.dll,LockWorkStation' in the location field.
Give the shortcut a name you like. That's it -- just double click on it and your computer will be locked. And if that's not easy enough, Windows key + L will do the same.