I know this question has to have been asked but I just wanted to verify real quickly. I sold my iMac aluminum and bought a used macbook pro that didn't come with the OSX recovery discs. Can I use the OSX discs that came with my iMac as backups for the macbook? I have heard that the software is tied to a particular machine but I just wanted to verify before I buy a new copy of Snow Leopard. THANKS!