[Quall999]

Your friend can probably set 3 different log-ins. One for him/herself, then one for each child. Then restrict access to specific folders like cookies and history.

Each cookie entry will have the username in the name, and give the time and site visited (adds included though). Restricting access would of course disable them from deleting files.

This doesn't help with time or the bill, but will keep track of where they are going and at what times. The service provider log-on app should keep a log on their PC, although that is not user specific. I guess comparing the log and cookie files?

Anyways, i have winXP so am unsure on what securities there are. But, if there are going to be seperate user logins for the same internet account, it would have to be something that their service provider allows, which most won't.