Readers involved in technical and sales support can learn the capabilities and limitations of systems, applications developers can learn effectively and efficiently how to interface to the system, systems programmers can learn how to maintain, track, and expand the system. Highlights: Details of major changes in process and memory management Describes the new extensible and stackable filesystem interface includes an invaluable chapter on the new file update information network system on the network and interprocess communication Written from the unique perspective of system architects, this book provides the most comprehensive, up-to-date, and authoritative technical information on the internal structure of the latest BSD system.