Can an iPad be hooked up to a projector to show PowerPoint presentations, word documents, or media? I hook up my MBP to an Epson projector at work via USB. Can this be done w/ the iPad? (Obviously not by USB...lol.) When I show video clips from my MBP via the projector and hook up external speakers, I plug the speaker jack thing into the audio in/out on the MBP. Would that work the same way with the iPad, if I can, in fact, do this?