Well...see...if I were a Doctor giving a presentation on the other side of the world (and I had a Doc's $$$), I would use my own brand new good 'ole USA Region 1 Titanium Powerbook for the presentation GUARANTEEING that the DVD would play.
NEVER trust someone else's gear - especially if your a$$ is on the line (as in a presentation).
...but that's just me.
- Joey