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From: Eli Zaretskii <eliz@elta.co.il>
Newsgroups: gmane.emacs.help
Subject: Re: how do i find out the platform emacs runs on?
Date: 01 Dec 2003 15:17:56 +0200
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In-reply-to: <hddhe0k7vuz.fsf@bacchus.pvv.ntnu.no> (message from Svend Tollak
	Munkejord on Mon, 01 Dec 2003 10:03:48 +0100)
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> From: Svend Tollak Munkejord <stm+direct_reply@bacchus.pvv.org>
> Newsgroups: gnu.emacs.help
> Date: Mon, 01 Dec 2003 10:03:48 +0100
> >
> > The command "M-x apropos-variable RET system RET" will show you a list
> > of all the variables that are useful for this and similar purposes.
> > No need to guess or try-and-err.
> 
> Here (GNU Emacs 21.3) "M-x apropos-variable RET system RET" lists
> 
> cperl-help-system
> file-coding-system-alist
>   Variable: Alist to decide a coding system to use for a file I/O operation.
> file-name-coding-system
>   Variable: *Coding system for encoding file names.
> keyboard-coding-system
>   Variable: Specify coding system for keyboard input.
> sendmail-coding-system
>   Variable: *Coding system for encoding the outgoing mail.
> 
> Nothing about `system-type'.

You missed the doc string of apropos-variable.  If you read it, you
will see the answer to this problem.