84AIntervention by Commonwealth Minister

84A  Intervention by Commonwealth Minister Commonwealth Minister may intervene  (1) The Commonwealth Minister may, at any time, on behalf of the Commonwealth, by giving written notice to the High Court or the Federal Court, intervene in a proceeding before the Court in a matter arising under this Act. Court may order costs against Commonwealth  (2) If the Commonwealth Minister intervenes in a proceeding before the Court, the Court may make an order as to costs against the Commonwealth. Commonwealth Minister taken to be a party for purposes of appeal  (3) If the Commonwealth Minister intervenes in a proceeding before the Court, then, for the purposes of the institution and prosecution of an appeal from a judgment given in the proceeding, the Commonwealth Minister is taken to be a party to the proceeding. Court may order costs against Commonwealth if Commonwealth Minister appeals  (4) If, under subsection (3), the Commonwealth Minister institutes an appeal from a judgment, a court hearing the appeal may make an order as to costs against the Commonwealth.