Section 400 - Method of commencing action or special proceeding1. An action is commenced in this court by filing a summons and complaint. A special proceeding is commenced by filing a notice of petition and petition or order to show cause and petition. For purposes of this section, and for purposes of section two hundred three of the civil practice law and rules, filing shall mean the delivery of the summons and complaint, the notice of petition and petition or order to show cause and petition to the clerk of the court in the county in which the action or special proceeding is brought together with any fee required by section nineteen hundred eleven of this act. At the time of filing, the original and a copy of the papers shall be date stamped by the court clerk who shall file the original and maintain a record of the filing and shall return the copy to the party who brought the filing. The clerk shall accept the fee and file the papers as soon as reasonably practicable.2. Jurisdiction is acquired over a party to an action or special proceeding by service upon such party of a copy of the summons and complaint, the notice of petition and petition or the order to show cause and petition.3. The actual index number shall be on the summons, notice of petition or order to show cause as served. Failure to include the index number on the papers as served shall be cured by stipulation between the parties or by leave of court, which shall not be unreasonably withheld.N.Y. New York City Civil Court Law § 400