In reply to:

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Yeah, but if you can get Displayserver working (or something like it), that's much cleaner and easier.

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I'd call it slightly cleaner and easier. You've still got to push out the codes one-by-one, and with no very good feedback (unless you work some kind of OCR reader into the client-side so it can watch what goes happens on the display).

What'd be MUCH better would be some way to have a client on the Rio itself that responds to commands, with good feedback, even if it's just "PLAY 3a95" or something. I don't suppose anyone's found any hooks in the player executable that'll let you shove a command at it? especially hooks with feedback?