maybe this post: http://kitchingroup.cheme.cmu.edu/blog/2013/05/05/Getting-keyword-options-in-org-files/ is close what you are looking for. you have to figure out how to go through all the buffers,but the code here should do the parsing for you.

John

-----------------------------------
John Kitchin
Associate Professor
Doherty Hall A207F
Department of Chemical Engineering
Carnegie Mellon University
Pittsburgh, PA 15213
412-268-7803
http://kitchingroup.cheme.cmu.edu

On Wed, Apr 2, 2014 at 6:27 AM, Martin <kleinerdrache@gmx.at> wrote:

Hi there,

I'd like to extend org-mode and its a bit hard to find all the
functions, but I don't like to redefine the wheel.

I have some special buffers for my case, and I'd like to mark them with
#+MYSPECIAL foo

so later I'd like to find all buffers having MYSPECIAL set and get the
"foo" which differs in my buffers, this is an identifyer of the special
org file.

How can I do that?

Thanks,
Martin