19. The Tribunal may, either of its own motion or on an application made in that behalf, dismiss any proceedings for want of prosecution.
20. An applicant may withdraw his application by notice in writing served upon the clerk and accompanied by the written consent of every other party to the application.
21.—(1) Any notice or other document required by these Rules to be served on the Tribunal may be sent by prepaid post to the clerk at the office.
(2) If it shall appear to the Tribunal that for any reason service on any person cannot readily be effected in the manner authorised by the Act or these Rules the Tribunal may direct that service on that person may be dispensed with or effected in such manner as the Tribunal may direct.
(3) Any party to proceedings may at any time change his address for service by notice in writing served on the Tribunal, and in that event the clerk shall notify every other party of the change.
22. Except by leave of the Tribunal and subject to the provisions of these Rules, no further step in any proceedings before the Tribunal shall be taken until the expiration of the time limited for service of an answer or of such extension of that time as the Tribunal may allow.
23. Subject to the provisions of the Act and of these Rules, the Tribunal may regulate its own procedure.