1 Pa. Code § 35.23
A person objecting to the approval of an application, petition, motion or other matter which is, or will be, under consideration by an agency may file a protest. No particular form of protest is required but the letter or writing should contain the name and address of the protestant, the proceeding or matter to which the protest is addressed and a concise statement of the protest. Only one copy of a protest need be filed. Service need not be effected upon the parties.
1 Pa. Code § 35.23
This section cited in 12 Pa. Code §11.8 (relating to petitions for declaratory order); 34 Pa. Code §111.15 (relating to no other pleadings allowed); 34 Pa. Code §131.32 (relating to petitions except petitions for joinder and challenge proceedings); 34 Pa. Code 131.121 (relating to penalty proceedings initiated by a party); 40 Pa. Code §17.13 (relating to protests/intervention procedure); 52 Pa. Code §5.51 (relating to protest to an application); 52 Pa. Code §1003.54 (relating to protests); 55 Pa. Code §41.61 (relating to filing of petitions to intervene); 61 Pa. Code §703.2 (relating to petition content); and 67 Pa. Code §441.3 (relating to permit application procedure).