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  Constant:  _GCLEARSCREEN, _GVIEWPORT, _GWINDOW
 
  Include:   <graph.h>
 
  Context:   _clearscreen
 
  Synopsis:  Specifies the area of the screen to be erased and filled
             with the current background color.
 
     The constants and their corresponding actions are as follows:
 
     Constant          Area Cleared and Filled
 
     _GCLEARSCREEN     Entire screen
     _GVIEWPORT        Current view port
     _GWINDOW          Current text window