So I just installed a new garage door opener, and somehow taught it how to recognize the two transmitters that came with it. The instructions assured me the openers would somehow 'roll their code' each time the door was opened as a security measure.
How does this work? For sure the transmitters don't cycle to a new code each time the button is pressed, else they'd get out of sequence too easily. Could it be there's some form of cross check, that the door opener transmits a signal the opener has to respond to?