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    FreeBee, an AT&T UNIX PC emulator retrocomputing unix philpem.me.uk
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      I’m currently looking for a good way to create a “virtual” serial port device on Linux, Windows and Mac OS X.

      VirtualBox would be a good example to follow. It uses UNIX domain sockets for virtual serial ports on UNIX-like systems. I’m not sure what it uses on Windows, but the functionality is there.