A party may direct written interrogatories to any other party. A copy of the interrogatories shall be served on all other parties entitled to notice.At some point, every New York state court practitioner will need to conduct discovery beyond the state's borders. 1. Except as otherwise provided herein, after commencement of an action, any party may serve upon any other party written interrogatories. Interrogatories are a discovery tool (among many) used in lawsuits in New York courts. In sum, these are written questions seeking specific information. This article will explain how attorneys outside of Illinois can get their subpoena issued in Illinois. Introduction. This pamphlet is intended as a general guide to assist a person in prosecuting a civil matter in the Appellate Division, Second Department. Service of interrogatories. Introduction. This pamphlet is intended as a general guide to assist a person in prosecuting a civil matter in the Appellate Division, Second Department.