The need for multilevel secure (MLS) systems still exists yet, the popularity of desktop systems has resulted in the imposition of new requirements. To be useful, a system must employ commercial-off-the-shelf (COTS) operating systems and office productivity software. We describe the preliminary architecture for a COTS-driven local area network that will provide MLS services to users while permitting them to employ standard office productivity tools on standard workstations. Our ongoing ...