You can learn to almost every button using both remotes. These remotes only have one Apex DVD code, and it's the one for the old AD600A player, but it might also work with the AD500W. Most of the other newer Apex models use a different code that's not in these remotes.
If you ever decide to get involved with JP1, the 15-2104 has a connector, the 15-2103 doesn't.
Rob.
http://www.hifi-remote.com