One can certainly send a disco#info to server on which you don't have an 
account, and the response is as expected, but that still requires an account on 
_a_ server - so the reply can be directed to you.

For pre-registration, I think support would have to be listed as a Stream 
Feature.

That said, you could just try it -- connect to a server and send a disco#info 
without any 'from' attribute; but I would expect an error response.

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