[mrerick]

The "Yellow" wire carries "composite analog video" in Standard Definition. All the video signal including all colors and luminance are combined on the one wire, but with some compromise of quality.

The "White/Red" wires carry left and right channels of analog audio.

It will all look better using the digital connections if they are available from your cable box.

The Red/Green/Blue input is for analog component video, and can work in high definition.

Your set may double use the "green / Composite" input for composite and component analog video, depending upon the input setting of the TV - either "AV" or "Component" from the list...

If both TV sets and the cable TV box are connected to a cable TV connection, they should all be able to receive the non-encrypted channels (premium but not pay per view). Just make sure that you've used the menu in each TV set to set the tuner to "cable" rather than "antenna" and then re-scan channels. "Cable" scans a broader range of frequencies that are sent down the cable system's cable. There is a narrower band of frequencies used over the air with antennas.

On most cable boxes, you can connect more than one output from the cable box to more than one television. This would allow the cable box to control both.

You can get some very long HDMI cables from Ebay very inexpensively... Search "HDMI cable 50ft".