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INT 21 - Concurrent DOS v3.2+ - INSTALLATION CHECK
        AX = 4451h
Return: CF set if not Concurrent DOS
            AX = error code (see AH=59h)
        CF clear if successful
            AH = single-tasking/multitasking nature
                10h single-tasking
                    AL = operating system version ID (see AX=4452h)
                14h multitasking
                    AL = operating system version ID
                        32h Concurrent PC DOS 3.2
                        41h Concurrent DOS 4.1
                        50h Concurrent DOS/XM 5.0 or Concurrent DOS/386 1.1
                        60h Concurrent DOS/XM 6.0 or Concurrent DOS/386 2.0
                        62h Concurrent DOS/XM 6.2 or Concurrent DOS/386 3.0
                        66h DR Multiuser DOS 5.1
Notes:  as of Concurrent DOS/XM 5.0 (possibly earlier), the version is stored
          in the environment variable VER
        use this function if you are looking for multitasking capabilities,
          AX=4452h for single-tasking
        this function should never return the single-tasking values
SeeAlso: AX=4459h

See Also: 214452
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