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  Arguments
 
    x, y      Viewport coordinates of pixel to be drawn
 
    wx, wy    Window coordinates of pixel to be drawn
 
  Description
 
    The _SetPixel and _SetPixel_w procedures set a specified pixel to
    the current graphics color. They cannot be used in text modes.
 
    _SetPixel sets the pixel at the viewport coordinate (x,y) to the
    current color. _SetPixel_w sets the pixel at window coordinats
    (wx,wy) to the current color.
 
  _GrStatus Returns
 
    _GrNoOutput, _GrNotInProperMode