INT 2F - DOS Protected-Mode InterfaceAn API which provides basic services for protected-mode programs to allocate memory, invoke real-mode software, etc. See also Virtual Control Program Interface. - DETECT MODE AX = 1686h Return: AX = 0000h if operating in protected mode under DPMIsee DOS Protected-Mode Interface (INT 31 available) AX nonzero if in real/V86see Virtual-86 Mode mode or no DPMIsee DOS Protected-Mode Interface (INT 31 not available) SeeAlso: AX=1687h