As the congress was local, instead of using my netbook for the talk I brought my MacBook. Instead of using arrow keys, I could use these fancy Apple remotes. Good plan... at the moment. I asked a colleague for his Apple remote (my girlfriend had hers in her office, and I could not get it soon enough)... And after lunch, before my talk I checked if it worked.
Well, as you already know, I use LaTeX and Beamer to create my presentations... And generate as output a PDF file. Which I then open with Preview, a native Mac OS app. And when I tried to use Apple Remote, it didn't pass the pages. Why? Well, Apple only supports a handful of applications, the most relevant being Keynote and Front Row. And not Preview. I was shocked.
As I expected, there was a free solution to this problem, but at first it looked troublesome. I found a program named iRedLite. The "Lite" part scared me: would I be only able to pass 30 pages and then need to enter my registration?
Turns out it is "Lite" because there is a Pro version which can interact with a USB infra-red emitter to control your TV and other gadgets. It works wonderful, no problems. If you ever need to give a PDF presentation with a Mac, give it a try.
I had another solution which hopefully I didn't have to use: a free application for iPhone, RemotePad and RemotePad server in my Mac (there is also a Linux version). But passing pages is a little cumbersome, needing to flip+scroll in a very small screen. Far better to use the remote with iRedLite!