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From: jb <jb.1234abcd@gmail.com>
Subject: Re: Assign program call to a key
Date: Sat, 3 Aug 2013 14:43:14 +0000 (UTC)
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Polytropon <freebsd <at> edvax.de> writes:

> 
> Is there a way to assign a predefined program call to a key
> in X, _independently_ from the window manager or desktop
> environment in use?
> ...

https://wiki.archlinux.org/index.php/Extra_Keyboard_Keys_in_Xorg
It may give you some hints.
jb