So, I just moved in a couple of days ago, and when Time Warner hooked up our cable box (SA 8300HD), we got a remote with something I haven't seen before. As with all other Synergy remotes I've seen, it has the A, B, and C buttons, all different colors and shapes.

But, this one also has a D button, diamond shaped and green. Nothing in our cable box refers to it, and the manual doesn't either. Does anyone have any idea what it is, or have any information on this remote?