Ill. Admin. Code tit. 50, § 9050.40
b) The Petitioner shall be present for examination at the time set for Oral Argument if:
c) In the event that the Petitioner does not choose to be present and no Commissioner requests the presence of the Petitioner, the Respondent may request the Petitioner's presence, subject to the discretion of a Commissioner of the assigned panel. If that presence is ordered, the Respondent shall pay the Petitioner directly, or his or her attorney, if represented, in advance of the time fixed for Oral Argument:
(Source: Amended at 40 Ill. Reg. 15764, effective November 9, 2016)