http://www.alloysoft.com/blog/adventures-with-airtunes
I'm considering adopting the DMCP protocol used by Apple's Remote app
for speaker control as that would allow me to provide this
information. I am hesitant to do it because this interface is totally
unsupported and Apple could lock it out at any time. They have already
done so on the Apple TV - it used to support the same interface but
Apple later restricted it to Home Sharing.
--
Matt Stevens
www.alloysoft.com