I've got a Chamberlain keychain remote and it works with homelink devices. I've got a lamp wired to a homelink access point. So I can open the garage door and turn on the lights before I get in. Picked it up at Home Depot for $30

 

Yes, but they won't work with certain non-rolling-code openers, such as the one in my community's gate (made by some German company whose products don't play nicely with anyone else's.)

 

Please dont bump old threads that contain dead links and errant info.