I have memories of the kiddie version of this, which was using "locked" down computers at stores or libraries and abusing the hell out of the context menu from,

I have memories of the kiddie version of this, which was using "locked" down computers at stores or libraries and abusing the hell out of the context menu from, say, an arbitrary print window that shouldn't appear, which would normally be enough to get you a separate Explorer (or File Explorer) window, from which you could do whatever. Or enough to launch a command prompt as well, depending on the system. Nothing quite so fancy, but in the same spirit.