you still need to agree on some things... For instance even if you're passing data through text, you have to agree on the actual encoding (Unix uses ascii, but there are lots of different text encodings!). You also have to agree on the meta-properties of the communication. How do programs find other programs to communicate with? How do they actually pass data to each other? How do they maintain transactional integrity (i.e. a request sometimes needs to be atomic, either happening or not happening, and the requesting program needs to know if a request happened!).
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