Pc-Guardian is a program which you install on your computer (on each computer you want to protect).
Every time the children turn on the computer the Pc-Guardian principal screens shows up. The purpose of the principal screen is to limit the free computer access. Your children can only use the computer when is in within the time schedule that you have defined.

Each child has its own username and password, which they use to access the computer.
When the child is using the computer, Pc-Guardian will register all his computer activities.
Later on all the registered activities are classified.
If an activity is detected with could be "dangerous" an email is sended to the parent to advise him of this event.