Switch presentation display on-the-fly

[fosley]

Hi! Is it possible to switch which display the presentation is shown on,
on-the-fly? Apparently, the people I'm working with are too computer
illiterate to understand monitor cloning (no surprise there) or "Slide Show
-> Set Up Show -> Display slide show on: The *other* monitor", so I'm hoping
there's a keyboard shortcut to swap displays on-the-fly. That way I could
simplify to "if it's wrong press this explicit keyboard combination".

I'm not sure how "the display that's not selected" is hard, but apparently
it is (But do I select "Primary Monitor" or "Monitor 2 Plug and Play Monitor"
and why isn't it called something easier to remember like "Projector"? It
doesn't matter, just select the one that isn't currently selected! Which one
is that? Arrrrggg!!!). Additionally, the person responsible changes out
every couple months, so it's far easier to have a single "press this"
instruction than trying to explain these things every couple months,
especially since I'm transferring next month and don't feel like getting
calls at the new location every few days.

Thanks!