Proper partner?

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Possible Answers: PRIM.

Random information on the term “PRIM”:

Created at MIT, as part of Project Athena, Zephyr was designed as an instant messaging protocol and application-suite with a heavy Unix background. Using the “do one thing, do it well” philosophy of Unix, it was made up of several separate programs working together to make a complete messaging system. Zephyr and IRC are the first widely used IP-based instant-messaging systems.
Taken from Wikipedia