Ok, it finally worked. I changed the zone 2 to md/tape which had in and out receptacles. Then, on the pc, I went into the home sharing page and made certain the denon could receive a stream. Then I opened WMP and selected a list of music to play and at the top of the WMP play page in the upper right hand corner is a little symbol that looks like an old cpu, that is the streamer... When you click on that it will ask 'cast to device' and I selected Denon, the music came right on. The album art and other particulars came up on the tv. I initially tried it from my desktop server with the external drive attached and it worked. But it also worked with a new tablet that came in the mail today with a windows os and media player.
There are 2 problems, but not with the denon, 1 - I can't shuffle the genre, which means the whole album plays before going to the next one or I have to select the tunes one by one, and 2 the volume is controlled by the media player. Once I turned it up, I could hear the music all over the house. I guess I have to fine the control for zone 2 for the other venues like the tuner because it wasn't controllable by the Sony. Hope this makes sense. And thanks for your help thinking thru this with me.