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Not just hardware access, most communication between programs also goes through the kernel; that which doesn't typically at least involved the kernel is setting up a more direct channel. However, for purposes of the question, it is also possible and practiced in far simpler cases to condense all the code into a single program.
– Chris Stratton
Commented Jul 27, 2018 at 23:58
Indeed, your terminal program doesn't even have to be running on the same machine as the program that's writing stuff to it.
– jamesqf
Commented Jul 28, 2018 at 5:26
Since it may need to be explicitly stated in this question - do note that when we talk about programs "talking to" each other, it's metaphorical.
– Stack Exchange Supports Israel
Commented Aug 1, 2018 at 4:20

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