UUCP `G' Protocol
=================

   The `G' protocol is used by SVR4 UUCP.  It is identical to the `g'
protocol, except that it is possible to modify the window and packet
sizes.  The SVR4 implementation of the `g' protocol reportedly is fixed
at a packet size of 64 and a window size of 7.  Supposedly SVR4 chose
to implement a new protocol using a new letter to avoid any potential
incompatibilities when using different packet or window sizes.

   Most implementations of the `g' protocol that accept packets larger
than 64 bytes will also accept packets smaller than whatever they
requested in the `INITB' packet.  The SVR4 `G' implementation is an
exception; it will only accept packets of precisely the size it
requests in the INITB packet.