the main functionalities are as follows:
* Discover Airport Express by Apple Rendezvous
* Browse music files
(Supported music file format: m4a(alac or aac), wav, mp3, ogg, aac, pls)
* Send selected files to the Airport Express
* Play mp3 stream data (filename started with "http://")
WWW: http://raop-play.sourceforge.net/
