I mean, empeg-car does not (officially) support Rio Receiver server-side SW, does it?

No; the server software is quite big and takes quite a lot of memory to run, so it'll probably won't be a part of the standard car player software any time soon.

Has anyone from the LDAP-server-and-Xwindows-on-empeg brigade succeeded in running the freeware receiver servers on a car player yet? (After quitting the player software, of course.)

Peter (who suspects you lot like a challenge...)