Introduction: Roger Needham -- On Access Control, Data Integration, and Their Languages -- Protocol Analysis, Composability and Computation -- Access Control in Distributed Systems -- Implementing Condition Variables with Semaphores -- Clumps, Clusters and Classification -- How to Implement Unnecessary Mutexes -- Bioware Languages -- The Economics of Open Systems -- From Universe to Global Internet -- Needham-Schroeder Goes to Court -- The Design of Reliable Operating Systems -- An Historical Connection between Time-Sharing and Virtual Circuits -- On Cross-Platform Security -- Distributed Computing Economics -- The Titan Influence -- Middleware? Muddleware! -- Grand Challenges for Computing Research -- Sentient Computing -- Cyber Security in Open Systems -- Software Components: Only the Giants Survive -- Security Protocols: Who Knows What Exactly? -- Volume Rendering by Ray-Casting in Shear-Image Order -- A Conceptual Authorization Model for Web Services -- The Trouble with Standards -- Novelty in the Nemesis Operating System -- A Technology Transfer Retrospective -- An Optical LAN -- What's in a Name? -- The Cryptographic Role of the Cleaning Lady -- Real Time in a Real Operating System -- Zen and the Art of Research Management -- The Descent of BAN -- Brief Encounters -- Retrieval System Models: What's New? -- Slammer: An Urgent Wake-Up Call -- Caching Trust Rather Than Content -- Least Privilege and More -- Using Sharing to Simplify System Management -- An RSA-Related Number-Theoretic Surprise -- Application-Private Networks -- Using the CORAL System to Discover Attacks on Security Protocols -- On the Role of Binding and Rate Adaptation in Packet Networks -- Technologies for Portable Computing: Outlook and Limitations -- Multiple Alternative Voting -- The Semiotics of Umbrellas -- Computers for Specialized Application Areas.