I purchased Warcraft III and Frozen Thorne last week and i have made account so i can play on battlenet. I was wondering as i share my computer with my brother, if he creates another account can he still play it on battlenet or do they link the cd key to the account?

you can create as many accounts as you like.
However if he gets banned it bans your CD key so yeah they are linked.
y mh 4?

You can't be logged in at the same time but. Will come up with "CD key in use".

Accounts are not linked - you can use any account with anybodies CD key. As mentioned though, if the account gets caught by warden or something like that, any CD keys the account logged on with to do these TOS violating activities will be banned.

ok, yeh we wont be on the same time.... it just that he wants his name and stats and i want mine...

yeah well u can create as many accounts as you like.
You can get banlisted by people and then just go and create a new account but if you are banned by bnet it will ban ur key.

I don't know if they changed it now, but if your brother is playing frozen thrown on bnet, you can at the same time as him play rain of chaos on bnet.