auto logoff user

From: AK (ak333@hotmail.com)
Date: 12/25/02 

From: "AK" <ak333@hotmail.com>
Date: Tue, 24 Dec 2002 20:09:35 -0800

If i want a user to use the computer in the defined
period, what should i do?
Now I am able to allow the user to logon during defined
period, but when the period is finish, user can still use
the computer. I want the system can logoff him
automatically.