http://www.adequacy.org/public/stories/2001.12.2.42056.2147.html
If your son spends more than thirty minutes each day on the computer, he may be using it to DOS other peoples sites. DOSing involves gaining access to the "command prompt" on other people's machines, and using it to tie up vital internet services. This can take up to eight hours. If your son is doing this, he is breaking the law, and you should stop him immediately. The safest policy is to limit your children's access to the computer to a maximum of forty-five minutes each day.
If you pay close attention to your son's reading habits, as I do, you will be able to determine a great deal about his opinions and hobbies. Children are at their most impressionable in the teenage years. Any father who has had a seventeen year old daughter attempt to sneak out on a date wearing make up and perfume is well aware of the effect that improper influences can have on inexperienced minds.