Int 2F Fn 160A  - Ms Windows 3.1 - Identify Windows Version And Type       [W]

   AX = 160Ah

Return: AX = 0000h if call supported
       BX = version (BH=major, BL=minor)
       CX = mode (0002h = standard, 0003h = enhanced)

See Also: AX=1600h,AX=4680h