Maybe waza04 will publish code and source as I don't have
MCE and would like to see how to interface to it.
Interfacing with Media Player is pretty simple, MS provide a COM+ object in the SDK. The hardest part is converting that data into the Escient format (Escient works on index numbers - as you say).
And regarding my original post about doing something like
this with my own media player. I never expected to open
a whole can of worms. All I can say is WOW!!!
As soon as I read your post that mentioned the Escient Protocol document being public I couldnt think of any reason why not to get started :)
An interesting thing is that this isnt limited to the playing of media, any form of two way communication can be built around the Prontos Escient control interface (until at least they release an SDK/API of some sort).