For example, when you set up your server, do not allow guest log-ons. Then that individual would have legitimate ways of getting into your system. And consider using filters. The more difficult part is deciding which words you want to filter. Similar to your district's student code of conduct, your AUP lets students know what they can and can't do online.
Teachers set clear guidelines on how to put chemicals together.
It's the same whenever students are learning to handle new tools. They need to know the rules so no one gets hurt. In your AUP, specify that school computers are to be used for educational purposes only. Many of our schools go much further in teaching students about safe and responsible Internet use. They are required to display the license when using any of the school's computers that provide Internet access.