Sit a non-programmer relative in front of each, and have them plug in a printer. One of them will end up with malware and maybe be able to print something, the other will almost certainly not even notice that they didn't have to do anything to make the print item in gmail put words on paper.

It amazes me in 2026 Windows printers still need drivers. This was a solved problem on iOS in 2010 and shortly after on MacOS with AirPrint