Another thing- You can also switch your HDDVR to 480i for sling box if yours doesn't do simultaneous output from the sling player. That's real inportant. On my HD Tivo I have it preprogrammed to toggle between my 720P setting and the 480i setting so when I'm at the remote viewing- I log in to sling box and if I get sound and no picture, I know the HDTIVO was in 720P. I hit the up arrow to select the other preprogrammed video output and that turns on the 480i.
Of course some of you may have the sling box connected to a DVR with dual output so this step won't be needed.
Of course some of you may have the sling box connected to a DVR with dual output so this step won't be needed.