Are their region requirements? Or can you play any Region DVD on these systems? (ex. If I bought an X-Box in US, could I play a DVD from Britan(R2) on it?)
You can buy regionless DVD players, and I'm told there are hacks to get around region encoding on a PC DVD player, but I've never looked... I have a japanese PS2 I use for playing japanese DVDs, and a region one player for my american stuff, and other than that, I've never had a need.