[vdr] VDR-Clients similar to Yamaha MusicCAST?

[Emil Naepflein <Emil.Naepflein@philosys.de>]

Hi,

last year Yamaha presented the MusicCAST system which provides an easy
multi room audio solution. Especially nice are the wireless client
systems with LCD display. 

http://www.yamaha.com/yec/musiccast/

Does someone know simple and not to expensive client hardware which can
be used to build a similar system with VDR?

Or does someone know what the protocol used by Yamaha is?

Emil