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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.help
Subject: Re: Can Emacs started with `-nw' option view pdf with pdf-tools?
Date: Sat, 17 Jul 2021 14:52:11 +0300
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 (message from Hongyi Zhao on Sat, 17 Jul 2021 18:37:51 +0800)
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> From: Hongyi Zhao <hongyi.zhao@gmail.com>
> Date: Sat, 17 Jul 2021 18:37:51 +0800
> Cc: help-gnu-emacs <help-gnu-emacs@gnu.org>
> 
> how to let `C-c C-v' open a GUI window for this case?

Start the server (M-x server-start RET), then connect with emacsclient
to that server, and you will have a GUI frame.

But I don't understand why you start Emacs with -nw if you then want
GUI frames in that session.  Why not start Emacs without -nw to begin
with?