SET COMMANDS
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These commands are used to set parameters connected with the drawing.

The commands are:-

    PAGE:-      Clears the viewport, preparing for more drawing
                operations. All current graphics attributes and
                specifications are retained.
                Selection with the LEFT puck button allows for a window
                to be specified such that entities outside the window
                will not be displayed or plotted (i.e. clipping limit).
                This window specification is current until cleared (by
                pressing the RIGHT button immediately after entering 
                this option). The window specification can be stored 
                on file for use during composition.
    SCALE:-     Sets the scale for the drawing.
    TOLER:-     Sets the tolerance (hit-radius) for pointer operations.
                This tolerance will be modified with ZOOMing to
                retain the definition in terms of screen units. The
                DEFAULT tolerance of 4 screen units (1 mm at 1:1)
                should be adequate for most purposes.
    RESOL:-     The resolution on the drawing of circles/arcs/curves
                may be defined by the user. This definition will only
                have effect on circles/arcs defined as having more
                than 24 sides. Default resolution is 0.25 mm.
    AXES:-      A new origin may be defined with translation and/or
                rotation. Co-ordinates of all points are to be
                modified. Position of the origin on screen can also
                be defined.
    REF:-       REFerence points (0, 1 or 2) may be defined for sub-
                drawings. These reference points are used to define
                how to HANG the sub-drawing upon retrieval. If 0
                reference points are defined, the sub-drawing can 
                only be retrieved as is. If 1 reference point is 
                defined, the sub-drawing can be positioned. If 2
                reference points are defined, the sub-drawing can
                be scaled and rotated.
    UNITS:-     Setting units to MM (Default), M, IN, FT or FT-IN. In
                the latter case, input unit is in INs. All internal
                storage are always in MM.
                If FRACTIONS option selected, all decimal output will
                be in fractions.
    GRID:-      The X and Y grid spacings can be set to any value. The 
                grid is used in SNAP mode (see MODE). Default is 10 mm.
                The grid may start from any user defined position.
                The grid can be at any angle to the global axes.
                Setting the grid activates the SNAP mode.
    HATCH:-     Specifying the hatch line spacings.
    COLOR:-     Altering the colour table. Intensity of the RED, GREEN
                and BLUE beams each represented by a two digit number.
    OFFST:-     A pair of DOUBLE PRECISION (64 bits) co-ordinates
                can be specified as an off-set.
    PLOTR:-     Initialize the on-line plotter. Can also write a plot
                file for off-line plotting.
                Selecting this option with the LEFT button will
                allow the user to minimize the responses required.
    CLEAR:-     Clears the drawing. None of the graphics attributes
                or current specifications are to be retained.
