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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.help
Subject: Re: local emacs and a remote emacs daemon
Date: Fri, 19 Jul 2019 17:08:15 +0300
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> From: Perry Smith <pedz@easesoftware.com>
> Date: Fri, 19 Jul 2019 08:13:14 -0500
> 
> Probably the best way to help me is to point me to the fundamental functions involved.  In effect, how does emacsclient “talk” to a daemon.  I assume there are some primitives that the rest of the functionality is built up from.  I’m assuming that the functionality built into emacsclient is also built into emacs (to rephrase, there is nothing essential in emacsclient that isn’t also in emacs).

The protocol between emacsclient and Emacs is in emacsclient.c and in
server.el.  in the latter you will see the commands that the client
sends and how each command is executed; you can then look up those
commands in the client source and see when each command is sent.