I remember at my high school they were plenty lenient with the computers, the only problem was that there were always kids on them, hehe. If you were in the library with your class and using the computer then yes, you'd get in trouble if you were on a message board or something because you should have been working on homework or doing research. They could monitored what kids were doing on each computer to make sure they weren't bringing up anything "adult", but you could go on message boards and check your mail whenever you wanted.
At my college they're quite easygoing, and there are so many computers! I swear there's like a computer lab every few feet, it's so cool. Most kids are working nonstop on papers or something for a class, but a lot of other kids are just goofing off, checking message boards and emails, IM'ing friends, or just cruising the net and looking at music videos and the like.
~Barb