Parties
§ 401. Parties. The party commencing a special proceeding shall be styled the petitioner and any adverse party the respondent. After a proceeding is commenced, no party shall be joined or interpleaded and no third-party practice or intervention shall be allowed, except by leave of court.
The one who starts a special proceeding is the petitioner; the other side is the respondent. ★ Once the proceeding is commenced, no party may be joined, interpleaded, brought in by third-party practice, or allowed to intervene — except by leave of court. ★ (Speed is the point; you can't freely enlarge the case.)
Marked in the text: penalties, time limits, sums of money. Editorial emphasis added by this edition; it does not appear in the statute as enacted.
This provision appears in Volume 2 — The JG-22 CPLR and in Volume 1 — The JG-22 in Plain English.