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From: Jason Rumney <jasonr@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: single init file/directory for windows and linux using version
 control svn or cvs
Date: Sat, 23 Sep 2006 11:17:32 +0100
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Xref: news.gmane.org gmane.emacs.devel:60132
Archived-At: <http://permalink.gmane.org/gmane.emacs.devel/60132>

CHENG Gao wrote:
> Checking registry, under \\HKEY_CURRENT_USER\\Volatile Environment,
>                                                 <- Volatile! Good wording! 
>   

This part of the environment is volatile because it is set at Windows 
startup from windows system calls after any network startup scripts are 
run. Emacs uses system API calls to discover these standard locations, 
not the environment variables, as this is more reliable across all 
versions of Emacs.