INT 2fH 4005H: Save Video Register State

                                                      Compatibility: Win 3.x 
  Expect: AX    4005H
  Return: none
    Info: VM-aware applications which have used INT 2fH 4000H (enable VM-
          assisted video save/restore) can intercept this fn and take
          whatever action is needed to save the state of the video

          The VDD calls this fn when it is about to access video memory;
          for instance, when it about to copy video memory to the

          The application must save the registers and return within 1000ms
          (1 second) or the VDD will go ahead and access video memory

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