typedef void (* XPLMReceiveMonitorBoundsGlobal_f)(
                         int                  inMonitorIndex,    
                         int                  inLeftBx,    
                         int                  inTopBx,    
                         int                  inRightBx,    
                         int                  inBottomBx,    
                         void *               inRefcon);    

This function is informed of the global bounds (in boxels) of a particular monitor within the X-Plane global desktop space. Note that X-Plane must be running in full screen on a monitor in order for that monitor to be passed to you in this callback.