Hi John, I think that the answer is that the B2 will respond to a remote control that can transmit the correct infra-red codes. There are some universal remotes that can assign Brennan codes to specific keys by pointing the two at each other and pressing the appropraite keys.
There was a discussion late last year about "big key" remotes for someone who is partially sight, I'm not sure what the final outcome was but if you search the forum you should find it...
Mike