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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Patch for emacs/basic.texi
Date: Wed, 16 Sep 2020 17:17:58 +0300
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> From: ams@gnu.org (Alfred M. Szmidt)
> Date: Wed, 16 Sep 2020 01:14:53 -0400
> Cc: emacs-devel@gnu.org
> 
>    +  On a graphics terminal, the easiest way to invoke @code{undo} is
>    +with @kbd{C-/}; that doesn't need the shift key.  On a text terminal,
>    +@kbd{C-/} does not exist, but usually you can type @kbd{C-_} without
>    +the shift key and it will work anyway.
> 
> That doesn't work on my terminal (wsvt25 or xterm with TERM=vt100);
> where one has to press C-_ (shifted).  C-- ignores the Control key,
> and does a self-insert-command on ?-.

Richard's text says "usually", so I guess it doesn't need to be
correct always?