Supreme Court Rules 1987

Where the third party files an appearance:

(a) the third party and the defendant by whom he was joined may have discovery of one another;

and

(b) unless the Court otherwise orders:

(i) the third party may attend and take part at the trial of the proceeding;

(ii) at the trial the questions between the defendant and the third party shall be tried concurrently with the questions between the plaintiff and the defendant; and

(iii) the third party shall be bound by the result of the trial.