I was "computer monitor" (no pun!) for a year in the 1990s, when I was about 10. I can't really remember the timing, but perhaps in the first half hour before

I was "computer monitor" (no pun!) for a year in the 1990s, when I was about 10. I can't really remember the timing, but perhaps in the first half hour before lessons had started I would go to the classrooms of the 5-8 year olds, and if the teacher wanted I'd switch on the classroom computer and load the required program. (Maybe a different child did the 9-11 year olds' classrooms?)