17 C.F.R. § 10.22
(a) Content. The complaint and notice of hearing shall include:
(2) The matters of fact and law to be considered and determined.
The complaint shall set forth the matters of fact alleged therein in such manner as will permit a specific response to each allegation. The notice shall notify the respondent of his right to a hearing and shall specify the time required by § 10.23 of these rules for the filing of an answer and the consequence of failure to file an answer.
(b) Service. The Proceedings Clerk shall give appropriate notice to each respondent by serving them with a copy of the complaint and notice of hearing. Service may be made in person, by confirmed telegraphic notice, or by registered mail or certified mail, addressed to the last known business or residence address of the person to be served or the address of his duly authorized agent for service. If a respondent is not found at his last known business or residence address and no forwarding address is available, additional service may be made, at the discretion of the Commission, as follows:
[41 FR 2511, Jan. 16, 1976, as amended at 60 FR 54802, Oct. 26, 1995; 63 FR 55791, Oct. 19, 1998]