A named pipe: write to it with one or more processes, read to it with another. All sorts of neat things become easier with a fifo.
See https://aplawrence.com/SCOFAQ/scotec7.html#netdevice for an example, and also https://aplawrence.com/Unixart/remoteprint.html. Here are some other ideas: https://searchenterpriselinux.techtarget.com/tip/1,289483,sid39_gci955458,00.html.
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