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From: Richard Stallman <rms@gnu.org>
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Subject: Re: Emacs server without emacsserver.
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    I don't know whether :family 'local is supported on all systems where
    emacsserver.c works -- if AF_UNIX is the only type of socket used by
    emacsserver.c,

I just remembered--on some systems, where HAVE_SOCKETS is not defind,
emacsserver.c uses SYSVIPC.  I don't think process.c supports them at
all.

The question is, I guess, whether those systems are all dead and gone.
It could be so.