If you TV has enough inputs, you can connect as many DirecTivos as you want. The ones that aren't connected to the sat signal will still play what they have recorded. I have a Hughes GXCEBOT connected to record my SD programs and an HR10-250 to record my HD programs. Both are connected to a Mitsu HDTV. And yes, one remote will control both receivers at the same time unless you change the remote address.
-Robert
-Robert