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
switches.

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
terminating.

- -

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