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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.help
Subject: Re: ediff on two files in two side by side emacs windows
Date: Sun, 02 May 2021 09:54:12 +0300
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> From: wael-zwaiter@gmx.com
> Date: Sun, 2 May 2021 00:14:21 +0200
> Sensitivity: Normal
> 
> Would it be possible to write an elisp function to run ediff
> on two windows that I have in my emacs frame?

There are already 2 commands to do that: ediff-windows-linewise and
ediff-windows-wordwise.  Is that what you want?