Thanks Eli. It doesn't produce the "undefined" error when emacs -Q.
Sorry not test under eamcs -Q before send the false bug.







------------------ Original ------------------
From:  "Eli Zaretskii"<eliz@gnu.org>;
Date:  Sun, Jul 8, 2018 10:28 PM
To:  "Shuguang Sun"<shuguang79@qq.com>;
Cc:  "32092"<32092@debbugs.gnu.org>; 
Subject:  Re: bug#32092: key for keyboard-escape-quit "M-ESC ESC" captured bywindows 7 first



> From: "Shuguang Sun" <shuguang79@qq.com>
> Date: Sun, 8 Jul 2018 15:28:18 +0800
> Feedback-ID: webmail:qq.com:bgforeign:bgforeign1
> 
> The keyboard-escape-quit is bound to M-ESC ESC, however, in Windows 7, the "M-ESC" is captured by the
> system first. It makes the key binding nosense.

Try "C-M-[ ESC" instead.

> I aslo tried ESC ESC ESC, and it reported that "<escape> ESC is undefined".

I cannot reproduce the problem with ESC ESC ESC, it works fine for me
with the current master.  Can you show a full recipe, starting from
"emacs -Q", where it produces the "undefined" error?