§ 168. Notices to attorneys at law by state bodies or officers. 1. Whenever a person is involved as a party in a proceeding before any body or officer exercising quasi-judicial or administrative functions, and an attorney at law has filed a notice of appearance in such proceeding on behalf of such person, a copy of all subsequent written communications or notices to such person in such proceeding (other than subpoenas) shall be sent to such attorney at law, and if any such subsequent written communication or notice is sent to the party in the proceeding, a copy of the same shall be sent to the attorney at law at the same time. Every such body or officer is authorized to provide by rule or regulation for the manner in which compliance with the requirements of this section shall be effected, including, but not limited to, the form and content of notices of appearance, the manner in which an attorney at law shall file his notice of appearance in a proceeding, and the manner in which written communications or notices shall be sent to the attorney at law. 2. For the purpose of this section:

(a) "person" shall mean one or more individuals, partnerships, corporations or associations;

(b) "proceeding" shall mean any quasi-judicial or administrative procedure instituted by a written application by a person to a body or officer, by a notice of assessment given by a body or officer to a person, by a written complaint addressed by a body or officer or transmitted by a body or officer to a person, or by a notice of any hearing before a body or officer whether or not such hearing is prescribed by statute. 3. This section shall not apply to preliminary investigations.