INT 2fH 1600H: Is Enh386 Windows Installed?

                                                      Compatibility: Win 3.x 
 Expects: AX    1600H
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 Returns: AX    if Enhanced-Mode Windows is not running, AL=00H or AL=80H.
                if Enh386 Win 3.x+ is installed: AL = major version number
                                                 AH = minor version number
                if Win/386 2.x is installed AL=01H or ffH
          ──────────────────────────────────────────────────────────────────
    Info: You may use this service to see if you are running is a DOS
          session under Enhanced-Mode Windows.

See Also: INT 2fH 16xxH: Enh386 Windows Services & Notifications
          INT 2fH: Multiplex Interrupt
          DOS Functions
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