36 CFR § 800.14(e)
This program alternative allows a federal agency to request the ACHP comment on a category of undertakings in lieu of commenting on a case-by-case basis. The ACHP may also provide comments on its own initiative. Program comments are especially advantageous to agencies that may have repetitive management actions for a large inventory of similar historic properties or for agencies that have programs that generate a large number of similar undertakings. Program comments can help an agency achieve a broader perspective in planning for similar historic properties it manages on a nationwide basis, allowing those resources to be placed within a national context. Public participation is conducted by the federal agency requesting the comments and consultation with SHPO/THPO, Indian tribes and Native Hawaiian organizations is conducted by the ACHP.
Learn more in the Program Comment Questions and Answers.