If your computer is used by several people, it is better to install a tool to protect it. PC-Controller can supervise your PC and your Internet connection and also record all the activities performed on the computer.

Note: it seems that the software hasn't been updated for several years. The version linked to this page is the latest to exist - so do not bother searching any further.

What are the key features of PC-Controller?

Monitor and supervise any activities on your computer.
Controls fully the computer (hard disk space, desktop, keyboard, etc.) and also the Internet navigator (Firefox, Internet Explorer, Internet address, Internet log, accessed links, etc.).
Records all the information about the computer and the Internet browsing.
Protected via a password.
Enable or disable the recording or the supervising of your computer at any time.
Invisible mode.
Set up a black list of websites not to open.