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PSET Statement Details
 
Syntax
  PSET [STEP](xcoordinate,ycoordinate) [,color]
 
  Argument      Description
  STEP          Indicates that the given xcoordinate and ycoordinate
                are relative, not absolute. The coordinates are
                treated as distances from the most recent cursor
                location, not distances from the (0,0) screen
                coordinate.
 
                For example, if the most recent point referenced were
                (10,10) then
                  PSET STEP (10,5)
                would reference the point at (20,15).
 
  xcoordinate   The x coordinate of the pixel that is to be set.
  ycoordinate   The y coordinate of the pixel that is to be set.
  color         The color attribute for the specified point.
 
If a coordinate is outside the current viewport, no action is taken nor is
an error message given.
 
PSET allows the color to be left off the command line. If it is omitted,
the default is the foreground color.