X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 21 - dr dos 3.41-5.0 - ioctl

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INT 21 - DR DOS 3.41-5.0 - IOCTL - DETERMINE DOS TYPE
        AX = 4452h
        CF set
Return: CF set if not DR DOS
            AX = error code (see AH=59h)
        CF clear if DR DOS
Notes:  the DR DOS version is stored in the environment variable VER
        Digital Research indicates that this call may change in future
          versions, making the installation check unreliable.  DR DOS 3.41+ is
          supposedly sufficiently compatible with MSDOS that programs need not
          decide which of the two they are running under.
SeeAlso: AX=4451h

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