(1) The Costs Court may give directions with respect to—
(a) the parties to whom a summons under Rule 63.38 shall be addressed;
(b) the parties who should attend or be represented on any taxation.
(2) The Costs Court may disallow the costs of attendance on a taxation of any party whose attendance is unnecessary.
(3) Notwithstanding paragraphs (1) and (2), any party interested may attend a taxation before the Costs Court.