def EventReturn (halt = False, remove = False):
  """
  Event handlers can return special values.  You can craft these with this
  function.

  If halt is True, further handlers will not be called for this particular
  event.

  If remove is True, the handler will be removed (i.e. unsubscribed) and
  will not be called anymore.

  Shortcut names are also available.  You can also simply do:
  return EventHalt
  return EventRemove
  return HaltAndRemove
  """
  return (halt, remove)