"Hi,
Don't need to worry. Things like that is designed to include your
worries. If you keep pushing remote button more than once, door will
stop/reverse/stop/reverse..... Right?
Tony "

Not if you're pushing it when out of range, which is the interesting
question he was asking.about rotating codes. From the link, it looks
like the door will accept any one of the next 256 codes. If you push
it more than that, it will be out of synch with the opener and will
require re-initializing it.