Ill. Admin. Code tit. 47, § 395.309
a) Pre-hearing Conferences: The Board may, on its own motion or on motion of any other party to the appeal, set a pre-hearing conference. The Board's decision whether to conduct a pre-hearing conference will be based on the complexity of the appeal, the issues in controversy and the potential for settlement. The Board shall issue a pre-hearing conference order setting forth the matters agreed to and rulings as to disputed matters. The order shall be served concurrently upon all parties and the Board shall control the subsequent course of the proceedings. The purpose of the pre-hearing conference shall be to:
c) Subpoenas: At any stage of the appeal and at its direction, the Board may issue subpoenas requiring the attendance and the giving of testimony by witnesses, or the production of books, papers, records, accounts, memoranda or other materials relevant to the appeal. Subpoenas may be issued either upon the Board's own motion or upon the written request of any party with a showing of the relevancy of the request to the issues in the hearing. In cases in which the Board receives a request for a subpoena, the Board shall grant or deny the request, either in writing or on the record. If any party fails or neglects to appear or testify or produce books, papers and records pursuant to the issuance of a subpoena by the Board, the Board may request the assistance of the Attorney General to invoke the aid of the circuit court within the jurisdiction in which the hearing is being held to request that the party be ordered to appear before the Board to testify or produce the requested evidence.