A quarter century ago I worked at a Blockbuster Video and the cashier computers had standard QWERTY keyboards, but I remember them having either an overlay or were manufactured to have every single random ass shortcut for the registers printed on them. It may have been a combination of both.
It was absolutely fucking hellacious. There was so much shit printed on every key that unless you already knew it was "E" you couldn't really tell. Letters, symbols, commands, they were all crammed onto these things. And some of the keys were different colors too to denote that they did other things on certain screens and menus.
I distinctly remember getting written up at work because some kid asked me if I could break a bill to give him quarters to get some gum and when I couldn't remember which series of keys to press to open the till the proper way I just punched Ctrl + Alt + Del which exited the point of sale and popped open the drawer (without logging the action, hence why I got in trouble for it).