I also remember figuring out how to share my USB key as a network drive to other users. Many fun middays were had blasting around in Halo or Soldier of Fortune II with like 10 friends, although less fun was had when our school's sysadmin found some lingering cache files that were owned by my id.
The number of emails I got from that was worth the vitriol contained in them, including threatened lawsuits.
Only approved programs software was supposed to run but you could actually run anything as long as the .exe was on the desktop.
7-zip would let you explore the entire network drive, including teachers folders that we didn't have access to.
Unplugging the reconnecting the Ethernet cable wouldn't reconnect you to the teachers monitoring software.
We had a zip filled with games like Starcraft 2, Quake 3, Halo CE that was hidden on the shared network drive that kids around the school would use to play and LAN with each other.