What Felix suggests is exactly how I set things up. A few things that could trip you up: 
- You likely want to make the button fire the Plex behavior on the global context in Remote Buddy. This way no matter what behavior is active, you can press this button and Plex will launch. 
- You may have to play around with the Harmony software some to see how the buttons map to the buttons defined in Remote Buddy (some of the names don't quite match because Remote Buddy has the button names for the physical Ultimate Remote, not the app)

You should not need Plex to be running in the background in order for Remote Buddy to launch it.

Last edited: 24.01.2015 02:00:56