All good parents know how useful the Internet is for their children, but also know there is a time for study and a time for relaxing. For this you need a security tool like Ez Internet Timer 1.1 which lets you decide at what time they can work and when they can have fun.
It lets you establish and restrict to set hours of the day (for example between 6 and 8pm, Monday to Friday) access for studying, and block other things like emails, instant messaging (like MSN), block access to other areas, etc.