share display list between two context in GLX
 

Hi all,
I'm running two screens at present, I display using opengl display lists, however I've found that I have to load a model/display list in twice once for each screen. There appears to be some glx commands which allow me to share display lists between screens, however to be honest I can't follow the documentation or find any examples.
Can anyone show me how to do this or point me in the direction of instructions?
I'm using opengl with GLX on Debian, I create the windows using XCreateWindow, set the context with glXMakeCurrent and buffer with glXSwapBuffers.

Thanks for the help :)