If you want to control the time your children spend on the PC, it´s best to use Child Timer. It is a program that automatically closes the user session when the assigned time is exceeded (daily or weekly). For parents Child Timer is an ideal tool, as it guarantees that your children won´t spend more time than you want on the PC.
Child Timer lets you administer various users (children) separately, and limit their access individually, both daily and weekly. The program avoids fighting and arguments over PC use at home.
Child Timer has support for a maximum of seven users, each one with their own user password. Its interface is fun and friendly, with reminiscences of cartoons, always aimed at the youngest in the house.