[JDEV] using jabber like an applicaton frontend

[Dodiesis]

Hi all!

i've just downloaded jabber server and now i'm travelling in the code...
but i need help.

I need a link, a start way to extend jabber. 
I'm tring to find the best way to execute my own C calls (or system
calls) when jabber server receive a special "message" from client.

like:
client send a "special message" -> jabber server parse the xml -> a
webcam on the server start to stream...

ok?
which is the best way?
is there an existing project linke this? 

tnx!

-- 
Dodiesis <dodiesis at sgrunt.net>