SwNtfy Fn 0000H: A Switcher Is Being Initialized

  Expect: AX    0000H
          ES:DI addr of switcher's service-entry address
  Return: AX    0000H if OK, as far as you're concerned
    Info: Task switchers call this fn when they are initialized.

          Programs that must take special action to coexist with a task
          switcher may need to handle this notification fn, but in most
          cases, it can be ignored.

    ES:SI will contain the task switcher's service entry address.  You can
          call that address with AX=0000H if you want some information
          about the task switcher that is being initialized.

  Return: AX=0000H if you have no objections to this new switcher being
          installed.  If a program returns a non-zero value, all tasks may
          receive SwNtfyFn 0007H (switcher is exiting).

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