How is Wave developed with GWT?

Whatever happens to Google Wave, its UI, in my opinion, is 'beautiful'. In fact, it's listed as a real world project that utilizes GWT on GWT's web site. I would like to learn how Wave was built using GWT, but there does not seem to be many docu开发者_StackOverflow社区mentation on that topic.

Could anyone please point me to the right direction with regards to documentation or show how that the Wave UI can be built using GWT.

Update: The question is how build the UI and not Wave itself.

You can browse through the reference source code and see how that's using GWT.

For starters I would check out this site that is built around the protocol that allows that sort of communication. At that point, it's just a matter of implementing a pretty UI in GWT (that's a bit of a simplification, but the gist is the same -- the protocol is really the meat and potatoes of Wave).