My understanding is that co-routines are called co-routines
because they are meant to be called from within another
closely related routine, and they pass control back and
forth between each other.
If you want to get to know them better, I would recommend
playing around with a language that has them. The two most
obvious ones are Scheme and Ruby. You might also find the
in C interesting (thanks to japhy for mentioning it
once). It discusses an actual problem which coroutines
would be a natural fit for, and then proceeds to show how
you can mimic them in C. (The program that paper is about,
is fairly widely used. If you are on Windows and
occasionally need to telnet, or would prefer to ssh
instead of telnet, then I strongly recommend looking into
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