RFID is a generic term for all kinds of different modulation formats and devices. All it really indicates is some sort of RF stimulous-response, with the passing of information. The TPMS in the Murano is RFID with tire pressure information being delivered.
The technology would be OEM'd from a partner of Nissans that would design based on security requirements, component cost, and desired modulation format. This could mean leverage from existing products or a new design.
Security and cost normally oppose each other. For example, Nissan uses ASK (Amplitude Shift Keying) on the previous generation key fobs. This is pretty easy to capture and decode, and would also be fairly easy to reproduce. However, the reality of someone actually doing it and being close enough to capture your signal, is extremely low.
Honda uses PSK (Phase Shift Keying) so the signal is a little tougher to decode.
When doing the new key fob, Nissan may have chosen to just add to the existing key fob design, by adding a simple reciever. Press the button on the Murano, it transmits, the key fob "hears" it, and sends the regular signal as always.
The cost would be very low to implement and add to the existing design.
However, if there is already parts they can buy that are cheap to do this with, they may have changed the whole system.
A quick way to answer this, is with a simple question. Do the older remotes also work on the system?
Probably more information than you wanted to know!
So to answer the question of other device recognition, it might happen if another manufacturer uses the same technology, but it's highly unlikely.
