You’d think, but I know of one POS system (in both senses of the term) that managed to do it accidentally. [Edit: on Windows 7, which you’d think would be able

You’d think, but I know of one POS system (in both senses of the term) that managed to do it accidentally. [Edit: on Windows 7, which you’d think would be able to handle stuff like this.] If you scanned a UPC into the quantity field it would lock up the entire OS, to the point that even Ctrl+Alt+Del was ignored and you had to hard-reboot the system. After years of this they finally gave us a patch that still froze the computer, but C+A+D would at least interrupt it. I never did work out how they managed to bungle things that badly.