I believe the system is called an "ADR" which I may be mistaken in recalling it to mean "Automatic Digital Registration"
One other minor point about this card. I never went to the Circus Circus in Tunica -- errrr Robinsonville, but have one of these cards in my name because the Gold Strike was using them for some time and the other version also. The Gold Strike took over the old CC, but it was the same Corp. is what I was told. Thought this was interesting info.