Just compiled netfwd for OS X and it seems to do the same thing as Multicom. It doesn't seem to have any function for creating virtual COM ports itself. However, it does allow you to precisely specify which serial device to redirect, whereas Multicom only allows you to select ones which are exposed as hardware through drivers. So netfwd could still be quite useful.
I did some more digging in to pty, and if I understand correctly, data squirted in to /dev/ptyp0 should come out at /dev/ttyp0. Is that right?
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