(cf SCR Part 11, rule 2)
(1) Except by leave of the court, a party may not take any step in proceedings (including any appearance in court) unless the party has filed a statement of claim or summons in the proceedings or has entered an appearance in the proceedings.
(2) Subrule (1) does not apply to--(a) a defendant who applies for an order under rule 12.11 (Setting aside originating process etc), or(b) a plaintiff who applies for an order under rule 25.2 (Order in urgent case before commencement of proceedings), or(c) a defendant who makes an application in relation to the setting aside or enforcement of any judgment.
(3) In any proceedings, a person (not being a party and not having filed a notice of motion) may not take any step in the proceedings (including any appearance in court) unless he or she has filed a notice of address for service.