Well I know that Ctrl-Space hides almost the entire interface, after which everything can be accessed via the hotbox, if that helps.
Ctrl-Space will bring it back up again.
I think Ctrl-Shift-M will also hide your panel menus and bring 'em back. There's also an option in the hotbox (can't quite remember where) to hide a couple of elements that Ctrl-Space doesn't.

The help files might give you some more specifics.