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                           ClearDevice procedure

  DECLARATION:  ClearDevice;

      PURPOSE:  Clears the current device and prepares it for output

         UNIT:  Graph

      REMARKS:  Moves the current pointer to (0,0) and clears the screen
                using the background color set by SetBkColor and prepares it
                for output.

 RESTRICTIONS:  Must first be in graphics mode.
See Also: ClearViewPort CloseGraph InitGraph RestoreCrtMode
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