I'm not 100% sure but I think it lets you add to second function to certain buttons on the remote. You activate the function by pressing the relevant button while you're holding the component select button (sort of like a shift key). I'm not sure if you can even 'learn' the second function onto the remote. But it does work out of the box for Sony components. For example, if you hold down TV and press 1, 2, or 3 it'll take you to directly to the Video1, Video2 and Video3 inputs on your TV.