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PRESET draws a specified point on the screen.
 
PRESET [STEP] (x%,y%) [,color&]
    ■ STEP indicates that the x and y coordinates are relative, not
      absolute. The coordinates are treated as distances from the most
      recent graphics cursor location, not distances from the (0,0)
      screen coordinate. For example, if the most recent graphics cursor
      location were (10,10), PRESET STEP (10,5) would draw a point at
      (20,15).
    ■ If the argument color& is omitted, the current background color
      is used.
 
Usage Notes
    ■ PRESET works exactly like PSET, except that if the color is not
      specified for a PSET statement, the current foreground color is
      the default.
    ■ If the coordinate is outside the current viewport, no action is
      taken, nor is an error message given.