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Join Date: Sep 2006
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One button press that performs many steps is called a macro. Activities and favorites are also macros. But Logitech calls the macro you've described a "sequence". The 900 can't do sequences because Logitech removed that feature from all their new remotes (my $15 remote can still do sequences).
Anyway, you're going to have to hack your way to a sequence by "raw" learning both commands very quickly into one learn like you said. Just go to the learning page and click custom, then click raw and learn a new command called "My DVR", then press DVR followed quickly by ENTER on your Comcast remote. When it's complete, "My DVR" will be in the list of availble commands in your activities that you can then assign to a button or the LCD.
Alternately, will simply pressing DVR twice accomplish the same thing? If so, I'd just do that.