From what I understand he is asking what Media Centre edition is considered to be.
So when, for example, a game's system requirements state XP Home or Pro, and MC isn't mentioned, whether MC counts as Home, Pro, or something else.
Not that he has 3 versions of XP on one machine.
That's the way I see it anyway, I could be wrong.
And by the way, that Wikipedia article states it is based on PlaystationOS.
Didn't see XP Pro mentioned at all.
So now my curiosity is piqued also.
I'll be following this thread, I think.