The RCRP05B is actually an 8 device remote, but it only has 5 device buttons.  A $8 cable will allow you to use the JP1 RMIR software to get access to all 8 devices.  Or if you get the URC remote edmund is talking about, the JP1 cable will allow you to program any IR signal into the RCRP05B, and then teach it to the URC.