From mboxrd@z Thu Jan  1 00:00:00 1970
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From: Christian Herenz <herenz@physik.hu-berlin.de>
Newsgroups: gmane.emacs.help
Subject: Re: Detect if Emacs is running in -nw mode
Date: Sun, 30 Mar 2008 03:22:55 +0200
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Will Parsons schrieb:

>> There is (not ...)  ;-)
>>
>> (when (not (window-system))
>>     ...)
> 
> Or how about (unless ...)
> 
> (unless (window-system)
>   ...) 
> 

So... That should do the trick. One last question, i assume that window-system 
can either be true or false. I searched the help for a variable called 
window-system but I found no explanation?
Where do I have to search for emacs "system-variables"?

Greets and thanks,
Christian