I am about to order Dish with 942 and have a few questions: 1. Can 942 delete programs intelligently, such as episodes more than 1 week old, or programs recorded but not watched for more than a month? 2. Can TV2 be connected through the house's cable system and ouput via coax wall outlet? 3. Can 942 send HD to TV2? 4. What is a diplexor?