What does the key trick in fords do?

Someone showed me a trick regarding Fords and the ignition system. If you put your key in and quickly turn it to Run(just before you turn it to start it) then back to Accessory a bunch of times your automatic locks will lock the car then unlock it. Why? What does this do to the car?
Please, if you don't know what it does, don't go out and try it.