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int pascal WinFillRect(HWND hWnd, LPRECT r, BYTE ch, WORD attr);

  This function fills a rectangular area of the screen with a
character and attribute pair. Please note that no clipping is
performed by this function. It is a low level function to fill an area
of the screen with character/attribute cells.

Parameters
  hWnd is a handle to a window.
  r is a pointer to a RECT structure.
  ch contains the character which will be used to fill the rectangle with.
  attr contains the attribute which will be used for the fill.

Returns
  Nothing.