Screen *XpGetScreenOfContext ( display, print_context ) 
      Display *display;
 
      XPContext print_context;
   
XpGetScreenOfContext returns the screen that is associated with the current print context of display. This call must be made after XpSetContext to determine which specific screen other X resources must be created on.
Each printer supported by a print server is associated with exactly one of the screens returned in the connection setup reply.
This function returns NULL if failed to get the screen.