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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.help
Subject: Re: Spawning autonomous shell commands
Date: Fri, 28 Sep 2012 09:06:48 +0200
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> From: Hilary <hils@newearth.demon.co.uk.invalid>
> Date: Thu, 27 Sep 2012 22:00:59 +0100
> 
> This may be partly a windoze question. I use this on a windoze box:
> 
> (defun espeak-region ()
>    "Send the region to espeak"
>    (interactive)
>    (shell-command-on-region (region-beginning) (region-end) "espeak -v 
> mb-en1 -p 50 -s 150 --stdin ")
>    )
> 
> It works, but it locks up emacs until espeak has finished reading the 
> text. Is there a way of spawning espeak as an autonomous process which 
> can finish in its own time?

See 'start-process' and 'process-send-region'.