How to do raw Ethernet under Win32?

[Grant Edwards]

How does one do raw Ethernet under Win32?  Ultimately, I want
to do it in a Python program, but if somebody can point me to a
clue on how to do it from C, I could probably figure out the
rest.

I want to:

 1) Send an arbitrary Ethernet packet.  [Well, not completely
    arbitrary, the source MAC will be "right", but the protocol
    number is a proprietary (not IP) one, and the packet isn't
    anything standard.

 2) Receive any incoming packets with a specified protocl
    number -- same proto number as in 1) above.
    
I've got a program that works under Linux, and I'd like to be
able to port it to Win32...

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