The head of any executive agency whose power or function as prescribed by law directly affects the public, may adopt rules having force and effect of law pursuant to HRS Chapter 91, setting forth procedures that are necessary for such agency in dealing with the public concerning such power or function.
(Sec. 1-10.1, R.O. 1978 (1983 Ed.)) (1990 Code, Ch. 1, Art. 9, § 1-9.1)