Follow these two links for a dscription of the track and Control modules used in this cabinet.

RFID uses small glass encapsulated 'tags', these contain a transmitter that when energized by a field generated by the 'reader' transmit a unique number which is received by the reader and passed as serial data to a PC. In this demonstration the tags are mounted on various items of stock, when they pass the reader a Powerpoint presentation is caused to display a page appropriate to the item in question.