I can answer the first one easily enough. The 970 uses discrete power on and off codes (done to make remote macros
much easier). The "Power" button serves as the discrete power off command.
Any input button (DVD, CD, Video1 through Video4, Tape, Aux) will serve two purposes: set the 970 to that input, and turn it on if it isn't already on. So, to turn it on just press the button for the input that you plan to use.
I'll take a stab at the second, but it's going to include some guesswork. The 970's remote (a Catalyst48 manufactured by UEI) uses the same database as a lot of other remotes (UEI being a
very large manufacturer). The best-documented siblings are the Radio Shack/One-For-All "JP1" remotes, and a great resource for them is
HiFi Remote . I'm not sure who builds DirecTV's boxes, as they aren't listed as a manufacturer in either Outlaw's manual or on HiFi Remote's
satellite code list . I think that the H20 is made by Hughes (suggesting codes 0749, 1142, or 1749), but my bit of web searching was not entirely conclusive. I'd start there, but you might also need to try some other codes from the lists in Outlaw's manual and the HiFi Remote site.