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PSET draws a specified point on the screen.
 
PSET [STEP] (x%,y%) [,color&]
    ■ STEP indicates that the given 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 was (10,10), PSET STEP (10,5) would refer to the point at
      (20,15).
    ■ The arguments x%,y% and color& are described on the Syntax Screen.
 
Usage Notes
    ■ PSET works exactly like PRESET, except that if the color is not
      specified for a PSET statement, the foreground color is selected.
    ■ If a coordinate is outside the current viewport, no action is
      taken, nor is an error message generated.