> At that time, printers already printed yellow dots with the serial ID. No schools in 1987 had color laser printers with this technology (and I doubt many bus

> At that time, printers already printed yellow dots with the serial ID. No schools in 1987 had color laser printers with this technology (and I doubt many businesses did either). Any students trying to do something fishy would have had to make do with, at best, 24-pin dot matrix printers with color ribbons.