INT 2fH 1609H: Windows is Terminating

                                                      Compatibility: Win 3.x 
  Expect: AX    1609H
  Return: none
    Info: TSRs and DOS-level device drivers may intercept this function as
          a way to be notified when Windows is terminating.  It lets you
          prepare to return to operating in a non-Windows environment.

          Windows calls this at the start of a Sys_VM_Terminate device
          control call.  All devices still exist at the time of this call,
          so you can still call device entry-point addresses, if necessary.

See Also: INT 2fH 16xxH: Enh386 Windows Services & Notifications
          INT 2fH: Multiplex Interrupt
          DOS Functions