The two examples above mention turning an LED on/off, but you can't use this button's LED directly for this. That NO pin you can liken to a typical push button, so : Examples > Digital I/O > Button and : Examples > Digital I/O > Switch and others apply. this pin is connected to the common pin when the button is pressed). this pin is connected to the common pin when the button is not pressed) and the NO (normally open - i.e. One is the 'common' pin, and the others are the NC (normally closed - i.e. If you look closely at the markings on there, you'll see the function of each of the quick disconnect tabs. The switch part is the white microswitch depicted in this product image: They're basically just a SPDT (Single Pole, Double Throw) switch and an LED.
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