Lock The Work Station

How to Lock a WorkStation Using ShortCut on Desktop,
Lock the Windows 2000 and Windows XP workstation

rundll32 user32.dll,LockWorkStation

create a new shortcut by using the desktop rightclick menu ,
1.A new shortcut will be created in desk top.
2.And it will ask for a location
3.In that location textfield type above given line(line in blue color)
4.Click Next ,It will ask for name give any useful name
5.Thats it you can use it as a shortcut to lock the workstation

Note:
This wont be of much help to normal users,
but it will be helpful for the programmers,
Normal users can use the following simple shortcuts,

Other Short cut keys to lock the workstation are,
1.Windows Key + l(windows key and letter 'l')
2. Press Ctrl+Alt+Delete ,after that press enter key

Source:
Orkut community