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a data structure that provides access to inter-process communication. For the past 40 years, this basically means network communication.

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What did network programs use to communicate before sockets was invented (around 1983?)

Sockets were invented in Berkeley around 1983, but how did networked computer programs work before this? … These days, pretty much everything uses sockets, so it's hard for me to imagine how else programs could communicate and Google turned up nothing. …
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