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Int 21 Fn F400  - Doubledos - Installation Check/program Status            [T]

   AX = F400h

Return: AL = 00h if DoubleDOS not present
      = 01h if running in visible DoubleDOS partition
      = 02h if running in the invisible DoubleDOS partition

See Also: AX=E400h,AH=F5h"DoubleDOS"
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