Does Firefox 4.X returns a Window value in Unix in NPP_SetWindow?

Hi all

NPError
NPP_SetWindow(NPP instance, NPWindow* window)
{
  char buf[100]; // Debug

  sprintf(buf, "window.window: %d\n", window->window);
 

}

Is window->window a X11 Window value in Unix? 

The Window is defined as follows in /usr/local/include/X11/X.h:

typedef XID Window;


Btw, I'm looking for the Window value to be supplied to SDL_CreateWindowFrom(Window w) in SDL 1.3.

Many thanks in advance.

Best regards
Unga