I got AppleTV and it came with a remote. Since the remote triggers action on both the AppleTV and iMac (they are in the same room), I disable the iMac from taking remote signal already.
But can I buy another Apple remote, and pair it with the Mac, so that this new remote will not trigger action on the AppleTV? That is, one remote for the Mac, one remote for AppleTV, and they don't interfere with each other.
Update: I actually went down to Apple Store and got another remote, and paired it with the iMac, and confirm that this remote will not trigger any action on the Apple TV, so now each remote works independently... I just put a sticker on one of the remotes to tell which is which.