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Use the following switches for the Windows character-mode debugger.  Refer
to the section called DOS and Windows Options for more Windows options.

/Fastswap
    specifies that Windows 3.x screen memory and the debugger's screen
    memory are to be swapped back and forth using a technique that is faster
    than the default method of screen swapping but not guaranteed to work
    for all video adapters.  This option applies to Windows 3.x only.  By
    default, the Windows 3.x version of the debugger uses a more
    conservative (and slower) method that works with all video adapters.