Ill. Admin. Code tit. 14, § 166.70
b) Any process, notice or demand to be served under this Part shall be made upon the Secretary, the Director, or any employee of the Department designated by the Director to accept such service for him or her, in the following manner:
c) The affidavit of compliance shall state:
1) the title of the court or administrative agency.
6) the basis for service on the Secretary.