the Transcoder admin interface is not the same as that of the DNAS. in earlier builds of the Transcoder there was a 'testui' folder which showed off the admin interface but it was flawed and removed a few builds back. will need to better clarify this in the documentation.
the admin interface is AJAX based and is covered by
http://wiki.winamp.com/wiki/SHOUTcas..._Specification
-daz