INT 31H 0902H: Query Virtual Interrupt State

                                                    Compatibility: DPMI 0.9+ 
 Expects: AX    0902H
 Returns: CF    NC (clear; always successful)
          AL    current setting: 00H = virtual interrupts are disabled
                                 01H = virtual interrupts are enabled
    Info: Obtains the current setting of the virtual interrupt flag.

          This fn is recommended over using the PUSHF opcode and examining
          the stack, since that returns the physical interrupt flag, rather
          than the virtualized flag tracked by the DPMI host.

See Also: DPMI API
          INT 2fH: Multiplex Interrupt
          DOS Functions