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        DualDisplay=<Boolean>

   Default: See "Purpose."
   Purpose: Normally, when running in 386 enhanced mode, the
            memory between B000:0000 and B7FF:000F will be
            used by the general system unless a secondary
            display is detected. If this setting is enabled,
            this memory will be left unused and available for
            display adapters. If this setting is disabled,
            the address range will be available on EGA
            systems but not under VGA systems, since the VGA
            display device supports monochrome modes, which
            use this address space.
   To change: Use Notepad to edit the SYSTEM.INI file.