Quick question about D3 installations+accounts

I've got 3 copies of D3 coming to me, so obviously all 3 have different cd keys. Is there a way to just install the first copy of D3 but enter in 3 keys separately? I'm confused as how to people get multiple accounts up and running with just one installation of D3.

[Alge]

I believe this is how it works...

You use the game keys to create 3 different battle.net accounts. You only need to install the game once. When you log in to the game you log in using those 3 separate accounts in 3 separate windows.

Thanks for the replies, Alge. I'll be hanging around here regularly and once I pick up on the basis I'll be doing my part to answer questions for those who were once in my shoes.