Holy shit, I had forgotten about SOLDAT. My friends and I used to play that on the library computers in middle school.

IIRC it had a portable version that you could boot from a flash drive. Or at least the installation happened on your local user account, so it didn’t require admin rights from the school IT team.

Also, the old Dungeon Siege games. IIRC, 1 and 2 both had LAN multiplayer, where each person took control of a different character. It was basically a precursor to Dragon Age Origins.