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Yes. That's the idea. What Google has open sourced so far has been a federation backend and a text client. As far as I'm aware there is only one other graphical client interface at this time called PyGoWave I think.

From what I can tell, yes, when you run it fully federated. Like email.

I don't know about the outside parties writing Wave clients for GOOG's Wave server; I myself am just starting read the docs.

Not really. There is no standard client-server protocol; each server may use a different one.

Is there a document explaining the protocol, something such as the RFCs of the IETF?

Never mind, I found it.

http://www.waveprotocol.org/draft-protocol-specs/draft-proto...