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xscreen


     NAME
	  xscreen - part of Simula to Xlib interface

     DESCRIPTION
	     X_Screen class XScreen;
	  See superclass for description.
	  SUPERS: X_Screen, Xlib_Screen, Xlib_object ;
	  KIND:	Instantiable, created by XDisplay object.;
	  INIT:	Initialises itself, created by XDisplay.;
	  Sequencing: (DefaultGC/RootWindow/DefaultColormap/
	  :    <Attributes>/<Query>)*
	  Attributes and Query	operations  described  in  super-class
	  X_Screen.

     ATTRIBUTES
     DefaultGC
	     ref(XGraphicalContext) DefaultGC;
	  Unique per Screen. Also  used	 to  initialize	 user  created
	  'GC's.

     RootWindow
	     ref(XWindow) RootWindow;
	  The background drawing area of the Screen.

     DefaultColormap
	     ref(XColormap) DefaultColormap;
	  Unique per Screen.