Gragh, students and their sodding games
I worked with students for quite a long time. One irritation was that they would insist on playing games on the lab computers which were meant for.. well, work. Back in those days all the games were DOS games, and they almost all used Mode 13h for graphics (320 x 200 pixels x 256 colours).
I knocked together a simple TSR that intercepted the interrupt that changed the display mode.. every time you tried to change to 13h it would display an error and reboot. The TSR was pretty well hidden, I don' t think any of the users ever figured it out.
The other essential DOS tool was an application that replaced the FORMAT command with one that checked to see if the user was trying to format C: (because yes, you could actually do that). If they were it would let off an alarm, which would tend to attract attention. Yes, students actually did this either maliciously or stupidly. If they were just trying to format a floppy disk, it would pass it on to the REAL format command which had simply been renamed.
What always flabbergasted me was when students were working on their dissertations, they wouldn't ever bother to have a backup copy of the floppy disk they had to store it on. Norton Utilities certainly rescued quite a few academic careers.
When we upgraded to a Novell network the problem was that the students would never log out, and students would end up with each others dissertations. Eventually, we wrote a screensaver in VB which would log them out automatically. Unfortunately, it would tend to do it while the students were looking up references in their books and it would shut down.. being not very observant, they didn't notice the GREAT BIG RED timer which gave them five minutes grace.