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USB "null modem" cables and related Linux driver questions

I have two computers with USB ports.
I wish them to communicate as simply as mid-20th-century computers did.
Then we used RS232-C with a null modem &/or appropriate software software at both ends.

The underlying problem is that both ends egotistically expect to be *MASTER*.

The hardware problem is solvable [e.g. http://www.ftdichip.com/Products/Cables/USBtoUSB.htm].

The software is another case :<
The best Linux specific link I've found is dated September 2005 [http://www.linux-usb.org/usbnet/]

I've done DuckDuckGo searches for permutations/combinations of
  usb, "peer to peer", lan, and bridge.
Most is Windows/Mac centric.
There were hints that needed drivers may exist in current Linux core.

Pointers to good references and/or better search terms?