Sorry, they don't.

I've just recently finished an IR to Crestron system, for client that absolutely had to have a handheld remote to run his Crestron system. Took quite a bit of doing on my part.

First off, the CNXIRGWA's codes are very hard to learn, and outside of the Pronto/RC5200's impossible to learn. Crestron will tell you this if you ask, but it's not documented anywhere that I found.

There is a way to do it using their newer equipment with an IR tube built in the unit, and then sending RC-5 codes that can be connected to join numbers. We used a single zone Xantech system around the home, and then send RC-5 codes/join numbers specific to the room the client wanted to control. Tough, but we're done now.