I think it's complete now. I made some internal changes: the server is checked for attached clients. The current server and all clients that are attached at your own server are using icons in full opaque style.
All other systems (servers and clients) are using a opacity of 0.4. So we won't need other icons.
Then there is currently a "*" in last column which indicates your current system.
I think it's enough to keep the list filtered to MP own UPnP devices.
looks good I believe it can be helpful in a household with several clients und is more professional than looking into log files, which is very uncomfortable with remote.