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 Sets a screen mode for a particular combination of display and adapter; not
 available when forms are showing. Use the SCREEN object with forms.
 See: ◄SCREEN Object►
 
    SCREEN mode% [,[colorswitch%] [,[activepage%] [,visiblepage%]]]
 
    ■ mode%         Integer constant or expression that selects a screen
                    mode for a particular combination of display and adapter:
 
                    Display/Adapter                            Screen Mode
                    ═══════════════════════════════════════    ═════════════
                    MDPA, CGA, Hercules, Olivetti,             ◄0►
                    EGA, VGA, or MCGA text only
 
                    CGA, EGA, VGA, or MCGA low- and medium-    ◄1, 2►
                    resolution graphics
 
                    Hercules and other adapters                ◄3, 4►
 
                    EGA and VGA medium- and high-resolution    ◄7, 8, 9►
                    graphics
 
                    EGA and VGA monochrome high-resolution     ◄10►
                    graphics
 
                    VGA and MCGA high-resolution graphics      ◄11, 12, 13►
 
    ■ colorswitch%  Integer expression that switches composite monitor
                    display between color and non-color (modes 0 and 1 only)
 
    ■ activepage%   Integer expression that identifies the screen page that
                    text or graphics output is written to
 
    ■ visiblepage%  Integer expression that identifies the screen page that
                    is displayed
 
 See Also
    ◄Graphics Command Summary►         ◄SCREEN Function►
    ◄Screen Mode Summary►              ◄SCREEN Object►