Also from my experience all of the sand-boxing software I ever saw at libraries or schools was always very poorly designed and trivially subvertible.
Felony charges are absolutely nuts though.
The computer labs were all IBM PS/2 model 30s running DOS. The servers were a model 70 running Netware. The school backbone was token ring.
The lab network ran on some oddball daisychain system. Telephone cable and the cards had two RJ11 jacks on them. Still trying to figure out what kind it was.
Once in a while someone would get banned from the library for a couple weeks (I think other kids that saw us started playing as well, so it was hard for them to identify a culprit), they would call in IT, overhaul their computers and we'd be back to laning a month later once things cooled off.