Except for those powers reserved exclusively to the “agency itself” under the Administrative Procedure Act (section 11500 et seq. of the Government Code), the Board delegates and confers upon the executive officer for the Board, or in his or her absence, his or her designee, all functions necessary to the dispatch of business of the Board in connection with investigative and administrative proceedings under the jurisdiction of the Board, including the authority to order an examination pursuant to section 820 of the Code or section 1381, or to approve a settlement agreement for the revocation, surrender, or interim suspension of a license or registration.