If you have a router, you can set time limits for accessing the internet with each computer. Check your router's web site for the settings.
There is also a way within XP to limit the computer use for each screen name.
HI there I need some software to limit time users can be on the computer, I don't know enough about wrighting rules, or the code for it. It needs to be something that's easy, I have windows xp and i'm talking about the profiles on windows xp not just atime limit over all. Help please!!!!!!