This episode's headline: High-Tech Frontier; Oil and Water; Dilemmas For Democracy. The guests include ROBERT MOSBACHER, Secretary of Commerce; MICHAEL DERTOUZOS, Massachusetts Institute of Technology; VICE ADM. CLYDE LUSK, Coast Guard; GOV. MIKE CASTLE, Delaware; CORRESPONDENT: PAUL SOLMAN; ESSAYIST: ROGER ROSENBLATT. Byline: In New York: ROBERT MacNeil; In Washington: JAMES LEHRER