[melismak]

Thanks. I saw a FAQ that said you have to change some preferences but I can't locate those on the new version of iTunes.

[Gossamer]

What exactly are you trying to do? You can install iTunes on as many computers as you would like. You can only play purchased music on computers that you've Authorized through iTunes, and you can authorize up to 5 computers at a time. When you attempt to play purchased music, it will prompt you to authorize.
You can play normal (unprotected) music on as many computers as you want however you want.

[jamil5454]

You can also set iTunes to share your music, then you can stream that music to any computer on the network using iTunes.