I just realized you and I have multiple "threads of conversation" going on at once. (which is OK.) I like your Actors example. Yeah, concurrency can't be defin

I just realized you and I have multiple "threads of conversation" going on at once. (which is OK.) I like your Actors example. Yeah, concurrency can't be defined in terms of "threads" in a specific implementation sense, but only in a more generic sense of "threds of execution," as in "execution contexts".