SwNtfy Fn 0007H: Switcher Is Exiting

  Expect: AX    0007H
          BX    flags: 0001H this is the only task switcher
                       0000H other task switchers exist
          ES:DI addr of switcher's service-entry address
  Return: AX    0000H (you must return 0 in all cases)
    Info: Task switchers call this to let you know when they are
          terminating.  It gives you a chance perform any necessary cleanup
          and disable any extra processing that you were doing to coexist
          with the switcher.

          When called, interrupts are enabled you may use all DOS fns.

       BX bit 0 will be set (BX=0001H) is this is the only active task
          switcher.  All other bits will be 0.

    ES:SI will contain the task switcher's service entry address.  Use this
          address if you need to call any task-switcher service fns.

  Return: AX=0000H you must return 0.  Tasks have not veto power here.

See Also: Switcher Services and Notifications
          INT 2fH 4bxxH (switcher functions)