He sent me a thanks and a comment. You are correct, he has a second TV in the back. His issue is that there are 2+ HDMI cables with the connectors color coded. There is also a splitter involved, but I'm not sure if it's splitting the incoming signal or joining the HDMI connections from the antenna and Blu-ray player and going to the TV. Since there are no pictures, I'm just guessing on the possible connections.
I think everything is hooked up, he is just asking what each of them is connected to, perhaps he wants to make labels for future reference.
Jsmith, I suggest you turn everything on, then disconnect one of the cables and see what goes off, then you'll know what it does and you can put a label on it. If you REALLY want to get into it, you can go to Lowes and get a signal generator that will send a signal through the wire that you can detect with the device. Just disconnecting and labeling should be all that you need, however.