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Nice article! In order to "pass messages" you have to have two things and one has to send a message to another - or one thing passing messages to itself. So if you have a function and it reads in data off the program stack from another function that is a form of message passing. I guess anything can be seen as message passing. Today however, when I think of message passing it usually in the contexts of threads or otherwise sequential processes communicating and not a single process sending messages to different segments of program code - and yet, as the article states, that is a perfectly legit way to think about it.

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