What really happens when programming a garage door opener? Is the
remote that gets programmed or the garage door opener? I would
like to program a remote so it can open the garage door. Becaue I
live in a condo, I do not want to program the garage door opener
in fear that if the door opener is programmer, other people may
not be able to operate the door.

I'm talking about the new style of opener which automatically
changes the code each time it opens the door, not the old kind
which has a fixed code.