We used to have the shareware version of Skyroads on our school computers. They couldn't get rid of it. They'd delete it off most of the computers. But a copy would always survive and get propagated via USB.
My highschool IT set up shares for each classroom/year (i.e. "Mrs. Beck 4th Hour 2001") and would moderate it's contents during the school year, but all previous years were just kept around for archival reasons but completely ignored.
They would configure our user shares to have all our classes automatically added for easy access, but you could manually add any other class or year.
This was back before phones or laptops were common in classrooms and everyone would bring games from home to contribute via flash drives or micro USB and also to sneak their bounty back home at the end of the day. A true sneakernet.
