X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 2f - multiplex - ms windows 3

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INT 2F - Multiplex - MS Windows 3 - INSTALLATION CHECK
        AX = 4680h
Return: AX = 0000h MS Windows 3.0 running in real (/R) or standard (/S) mode
           nonzero  no Windows, Windows prior to 3.0, or Windows3 in enhanced
                    mode
Note:   not officially documented, but Microsoft has indicated that they
          intend to provide an installation check which works in all modes
SeeAlso: AX=1600h

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