What you call variables is irrelevant. The first return from an event firing is the frame that was listening to it. The second return is the specific event that was fired in case your frame was listening for more than one. Beyond that, anything else depends on which event it was and what comes with it.
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"You'd be surprised how many people violate this simple principle every day of their lives and try to fit square pegs into round holes, ignoring the clear reality that Things Are As They Are." -Benjamin Hoff, The Tao of Pooh
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