INT 2fH 4006H: Restore Video Register State

                                                      Compatibility: Win 3.x 
  Expect: AX    4006H
  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 restore the state of the video
          registers to what it was at the time of the previous
          INT 2fH 4006H (save vid regs) call.

          Before calling this, the VDD restores the registers to what they
          were at the time of the original INT 2fH 4000H call; thus the
          application need only modify video registers which differ from
          their earlier settings.

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