CasaTunes recently released a ProntoScript for the TSU9400 and the TSU9600/9800 remotes. It is open source (in other words, no protection and not compressed) and available at CasaTunes.com/downloads.
Please don't be too critical of the software, it was my first JavaScript, but it works well and might help others with some things like multicast and interfacing to web services. Sorry, you can't use it with the Pronto emulator because of the http and UDP
It requires CasaTunes software, which you can get on a trial basis at the same download site.

Kim

Kim,

Congratulations - I'll download it and have a look.

For info, the simulator does handle TCPIP/http (not sure about UDP) if you use Jon Welfringer's enhancement to it. Its great because it effectively means that I have an additional working Pronto on every one of my PCs, as well as substantially easing testing.

Hello Guy,
If you use Jon's mod, it will work to an extent. We use UDP for updates, so some things in the emulater, like clicking on Next and Previous when viewing a room, won't show up until you leave that screen and come back. Please don't judget the operation based on the emulator results :-)
Let me know what you think!