4.—(1) The registrar shall, as soon as practicable after the commencement of proceedings before the Tribunal, send to each party a notice informing him of the date, time and place of the hearing.
(2) Upon receipt of a notice of intention to respond from a person who is not already a party to the proceedings, the registrar shall send to that person a notice informing him of the date, time and place of the hearing.