Emulate ctrl-alt-supr y windows to lock the session

Hi! I'm doing an application for a PC class room. I want to make a software that from the server it can block a PC, the same way ctrl-alt-del does. I mean, I don't want to try to block it by pure java (I think this is impossible), but what I want to know, if is there is some way to lock it with windows commands.
Thanks a lot for your help!

The Win32 API function LockWorkstation will lock the machine
(http://msdn.microsoft.com/library/default.asp?url=/library/en-us/sysinfo/base/lockworkstation.asp).
You can either use JNI to call the function, or run the following command:
rundll32 user32.dll,LockWorkStation

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Recent crashes of certain multimedia contents (this includes Youtube videos, certain flash games and other applications) in conjunction with Firefox are most probably caused by a recent Flash update and/or a malfunctioning browser plugin such as Real Player.
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Emulate ctrl-alt-supr y windows to lock the session

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