() Jorgen Schaefer <forcer@forcix.cx>
() Fri, 24 Jan 2014 11:25:20 +0100

   There does not seem to be a need to return a function which is called
   to run another function? Just letting the Emacs code know that we
   might add completions later and then calling some well-known function
   with additional completions once they are available would be
   sufficient I think?

That is sufficient for 1:1 communication.  To support multiple channels
(which is likely for Emacs -- think multiple buffers), some kind of tag
(identifying cookie) is required.  A tag w/ direction is a continuation.

-- 
Thien-Thi Nguyen
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