Thanks for the response. I was able to find a workaround.
More than you care to know about the X10. It's a device for sending the output of your TV (or DVD player or VCR or camcorder or whatever) to another, or several, televisions in the same house. Some people use it to avoid having to buy a second converter box for cable or satellite. It doesn't let you watch two different programs on two sets, but you're not limited to one set for cable channels. I got it for my sister so she and her husband could watch movies while moving around the house. Ideally, the transmitting source should be a TV with video and audio output sockets, but their older Sony big-screen doesn't have them.
"The movie was so bad the footprints outside the theater got up and left."--Red Skelton