We had mostly fast P3s and some early P4s when I was in high school, this would have been around 2003-2004.
We played a lot of CS, Skynet, UT99, UT 2K3 and later 2K4. Also played a lot of Street Fighter and Starcraft and probably a few others I'm forgetting. We had a computer engineering course right before lunch, so we'd just blow through that playing whatever, then blow through lunch as well. I had physics right after lunch, but my teacher had the worst accent ever, couldn't understand a word she said... so I ended up skipping most of the rest of the term to game in the computer lab two doors down. Had a programming class as well that I blew away playing mostly UT.
I knew the dude who ran the computer lab, was a co-op student doing his work term. I was able to get an admin password from him; we practically owned the lab for most of the year. At some point the password was changed on the admin account I was using, but I was able to guess the new password. Created a new admin account for myself, problem solved after that.
I had copies of games uploaded to my network share for installation on every computer I could get my hands on. By the middle of the term, there was always a CS or UT game taking place somewhere in the school.
Next year I heard they cracked down on network security and reduced the size of student network shares, probably because mine was ridiculously large compared to most others; I believe had at least 5GB of space at one point. Didn't matter that much as I had moved by then.
I think the only legit memorable thing I actually did in any computer related course was program a text-based RPG based on The Terminator.
Later on in college I remember we played a lot of CS 1.6 and Skulltag, also a lot of Quake.
Crimson Tide - EVGA 1000P2; ASUS Z10PE-D8 WS; 2x E5-2697 v3 14C 3.8 GHz on all cores (All core hack); 64GB Samsung DDR4-2133 ECC
EVGA 1080 Ti FTW3; EVGA 750 Ti SC; Sound Blaster Z