I have a home theater with a projector that will accept digital cable with HDTV. We have used the theater primarily to view DVDs and watch TV on a Sony rear projection unit in another room. Next week I am having digital cable installed. The installer is goning to bring one digital cable box with HDTV capabilities for my theater unit and another digital cable box for my other television. My question is... Do I really need two digital cable boxes, or is there a way to utilize one box for both units? If so, how do I change channels with viewing units in seperate rooms? Thank you.