Interrupt 92 - Long Entry

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INT 21 - DoubleDOS - INSTALLATION CHECK/PROGRAM STATUS
        AX = E400h
Return: AL = 00h if DoubleDOS not present
           = 01h if running in visible DoubleDOS partition
           = 02h if running in the invisible DoubleDOS partition
SeeAlso: AX=F400h

See Also: 21E5

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