. . . . "Considering a single RFID tag 16A (but the description equally applicable to all the RFID tags 16A-16C), RFID tag 16A comprises a tag antenna 17A which couples to an RFID circuit 18A. The RFID circuit 18A implements in hardware (or a combination of hardware and software) various state machines, microprocessors, logic or other circuits to enable the RFID circuit to receive signals from the RFID rea" .