@quaza ah i see. so i conclude that i (SEA version) can't play with my brother (EU version) for now, but "a few months down the road" it might be possible (according to blizzard).

@holyboyz as far as i know, cannot. Example if I have US version SC2 installed, when I try to login using my bnet acct with a SEA version SC2, it will say no SC2 game available.

Anyway, just a thought. It's possible to install and play on multiple machines so long as only one is logged in to bnet at a time. But for single player, you can choose to play offline instead of logging in to bnet. Therefore, theoretically speaking is it not possible to use my bnet login to 'activate' a friend/sister/brother/whoever's machine for single player, then that person can then happily campaign away in offline mode all he/she wants?

you mean if i puchase a US version which cost usd59, then shoot an mail to blizzard then will automatic transfer to SEA version which cost usd75?

if then i can buy us version CE.....