This is fairly old, but I am kind of curious myself. I am pretty sure the RF "Button" is the button that you use to switch your radio bands off with for airplane use or whatever the case. Usually laptops have a switch on the front and you flip it and wifi, bluetooth, and all other RF emitters disable.
However, my laptop doesn't have one(outside from windows 8 software option) and I had a driver update for it recently and thus here I am.
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