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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Does a diagram of the key input subsystem exist?
Date: Wed, 01 Sep 2021 05:30:20 +0300
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To: "Perry E. Metzger" <perry@piermont.com>
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> Date: Tue, 31 Aug 2021 16:54:43 -0400
> From: "Perry E. Metzger" <perry@piermont.com>
> 
> So in an attempt to debug the input method I've been trying to write, 
> I've been trying to understand how typed keys make it from the user up 
> to the point where processing stops, and failing very miserably. The 
> elisp manual has a maze of hints, but they're not nearly as informative 
> as I would have hoped.
> 
> Is there anything like a document or diagram that lists the steps, 
> translation tables, maps, etc. that every keystroke goes through in its 
> journey? My guess is no, but I thought I would ask.

You mean, the description of what the read_char does?