Late 80s and my junior high school computerized attendance reporting (and some grades) through shared documents on a 'teacher' Appletalk share I had access to (because I set it up!) Well now... ;) Honestly though I never did any of that sort of thing for profit, I managed to satisfy my needs selling disks with games on them and then turning a blind eye when people were playing them during class hours (I was basically used as a free labour resource by the school so I don't feel bad about that in the slightest.) Ah, the things we did when we were teenagers...