Super.  Thank you for the links.  I have some reading to do, as I am
confused about the fourth concurrent operation from Yokote's work.  (async
send, async receive, return, and acknowledge)  I don't understand the use of
acknowledge as a primitive operation.

Rob

> It was the language of the J-Machine:
> 
>    http://cva.stanford.edu/j-machine/cva_j_machine.html
> 
http://www.acm.org/pubs/citations/proceedings/oops/28697/p331-yokote/
 http://www.acm.org/pubs/citations/proceedings/oops/38765/p406-yokote/

-- Jecel

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