Also, the AR layer is a layer on the outer plastic protective screen, which gives it a sort of blue/purple hue when tilted in teh light. On some GP32s, it comes off if the screen is wiped too hard.
Also, I'm not referring to that annoying piece of plastic thats on the screen when it's shipped, and which some people keep on (!). If you keep it on, you're way too protective, and also negate the point of having the AR coating onm the screen in the first place!