((I swear, I need to be cut off from all net access three weeks before my trip, my questions get stupider and stupider))

So-you have your standard WDW autograph book-it has the nifty pen loop, a place for your name and phone number, and a plastic thing on the side. What is the plastic thing for? YoungerNephew asked today when he and his brother got their going to Disney gifts today, and I was stumped.