A reporter complies with a subpoena for testimony in a criminal trial by appearing and giving testimony at the appointed time. Fed. R. Crim. P. 17(a). A reporter complies with a subpoena for documents or other items in a criminal proceeding by producing the subpoenaed materials at the time and in the manner appointed in the subpoena. Fed. R. Crim. P. 17(c). A reporter complies with a subpoena for documents in a civil trial by producing the documents "as they are kept in the usual course of business" or in a way "to correspond with the categories in the demand." Fed. R. Civ. P. 45(d)(1). If a subpoena commands only documents or other tangible things, and not testimony, it is not necessary to appear at the hearing or trial. Fed. R. Civ. P. 45(c)(2)(A).