INT 2fH 4007H: Disable VM-Assisted Video Save/Restore

                                                      Compatibility: Win 3.x 
 Expects: AX    4007H
  Return: none
    Info: This stops the VDD from notifying a VM-aware application about
          video register activities and pending background/foreground

          The VDD will no longer call:

           INT 2fH 4001H (ntfy: about to switch to background)
           INT 2fH 4002H (ntfy: about to switch to foreground)

           INT 2fH 4005H (ntfy: save video registers)
           INT 2fH 4006H (ntfy: restore video registers)

          And it will ignore calls to:

           INT 2fH 4003H (srvc: enter critical section)
           INT 2fH 4004H (srvc: exit critical section)

          This is typically used by VM-aware applications when they are

See Also: INT 2fH 40xxH: Virtual Display Driver Functions
          INT 2fH: Multiplex Interrupt
          DOS Functions