Such direction, application, or stipulation must be served on all parties to the action and filed with proof of service. Interrogatories are numbered written questions sent to the other side.Party seeking discovery should incur the costs in the production of discovery material. T.A. Ahern Contractors Corp. v. You may serve different interrogatories on different parties. A party may serve on any other party no more than 25 written interrogatories, including all discrete subparts. I was served with a summons and complaint answerable in District Court of Nassau County, First District: Hempstead. Who participated in any way in the preparation of, the Nassau. County defendants' answers to any of the interrogatories set forth above. As soon as the answer comes in, the clock starts ticking on discovery.