At this point, the HR20 is now on the network.
However, it doesn't "do" anything on the network.
Right now, DirecTV has partnered with Intel, to make the HR20 a ViiV compliant system.
The PC side of things is all in the hands of Intel and Microsoft Media Center.
Here are some key things:
Your ViiV PC needs to be running Intel ViiV version 1.5 or higher.
In v1.5 they introduced an update Intel Media Server... This is the PC component that "serves up" the photos and music files to the ViiV devices... and is the key to the HR20 being able to access the files.
Intel's website for ViiV:
http://www.intel.com/products/viiv/index.htm
DirecTV is working right now with Intel to establish a "Setup ViiV" document, file download area on DirecTV.com (and forums.directv.com). However, at the time of this writing it is not available yet.
--------------
So you are kinda on your own a bit with getting the PC side of things going.
We (here at the forums), will try to help where we can....
Some tips from my usage:
1) You should do a Network Scan, from the ViiV software. This should "show" your HR20 on your network. You need to click on the DirecTV device, and authorize it to have access to your ViiV files.
2) You can share files from any of your systems on your network. So long as your ViiV system can see them. For example, I had my Music file on my Windows 2003 server. I opened up a share, set Guest Access to it... and the ViiV system was able to "serve" those files, without having a local copy.
3) If you don't have your files in your "Shared Document" directories... you will need to share that folder specifically with your network. It only needs to have READ access to that share.
4) Media Center is bulkly and tedious... so be a little patient with it. If things really get slow or goofy, reboot your PC.