Dunno what made me think of this just now. When I worked for IT in a school district way back in the 90s, a librarian told me she kept a supply of mouse balls in her desk because kids would steal them out of the school computers. What I remember about those balls was they picked up dust and crud off surfaces. Pretty soon optical mice came along and they were history.
In my school, the teacher’s computer had software running to remotely control the student’s computers, lock them or see a mosaic of all the student screens to make sure they are doing what they should be doing.
Except, the computers were all run with admin rights and you could just open the task manager, kill a couple processes, and the remove software didn’t work.
We always said it just must have been buggy software.
Sorry Mr. W. You were one of my favorite teachers, but that secret had to be kept a close secret between students