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 Captures a graphics screen image (GET); displays an image captured by GET
 (PUT); not available when forms are showing.
 
    GET [STEP](x1!,y1!)-[STEP](x2!,y2!), arrayname[(index%)]
    PUT [STEP](x1!,y1!), arrayname[(index%)] [,actionverb]
 
    ■ STEP          Specifies that coordinates are relative to the current
                    graphics cursor position
 
    ■ (x1!,y1!)     Upper-left coordinates of the image captured by GET,
                    or of the screen location where PUT displays the image
 
    ■ (x2!,y2!)     Lower-right coordinates of the captured image
 
    ■ arrayname     Name of the array that stores the image
 
    ■ index%        Numeric constants or variables indicating the element
                    of the array where the saved image starts
 
    ■ actionverb    Indicates how the image is displayed, using one of
                    the following keywords:
 
                    Keyword       Description
                    ═══════       ══════════════════════════════════════════
                    AND           Transfers over existing image
                    OR            Superimposes image on existing image
                    PRESET        Transfers negative image point-by-point
                    PSET          Transfers point-by-point
                    XOR           (Default) Inverts the points
 
 See Also
    ◄GET Statement (File I/O)►        ◄Graphics Command Summary►
    ◄PUT Statement (File I/O)►        ◄Screen Image Arrays and Compatibility►