HKEY_CURRENT_USER\Software\Microsoft\Command Processor allows you to use a key (e.g. TAB) to autocomplete paths as you are composing a command line. That's sweet.
But yesterday I discovered a really cool trick on top of that. Just drag a file and drop it on a dos box and see what I mean. Not as useful as the completion character, I know, but sure to impress your party guests, no?
