Is this sole function to enable you to watch programing on 2 different tvs or does it have something to do with recording one show & watching another? Do you have to use both tv1 & tv2? I would like to be able to watch one channel & record another but only on one tv. With dual tuners, does that require a 2nd cable run from the dish? What other changes would need to be implemented from my present system of: (1) receiver upstairs & (1) receiver downstairs? 
