Readers may be interested in a more general approach to this issue: http://all.net/ => Technical Safeguards => 1992: Operating System Protection Through Program Evolution FC -- This communication is confidential to the parties it is intended to serve -- Fred Cohen - http://all.net/ - fc@all.net - fc@unhca.com - tel/fax: 925-454-0171 Fred Cohen & Associates - University of New Haven - Security Posture