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The 'ippget' Delivery Method for Event Notifications Status of This Memo This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited.

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As part of its effort to periodically investigate various new promising concepts and techniques, the Digital Equipment Corporation has sponsored a research project whose purpose it was to effect a limited implementation of a protective operating system framework, based on the kernel/domain architecture which has increasingly been propounded in recent years. The project was carried out in 1972, and its successful completion has led to a substantial number of observations and insights. This paper reports on the more significant ones, specifically: 1) the techniques used in mapping a conceptual model onto commercially available hardware (the PDP-11/45 mini-computer), 2) the domain's memory mapping properties, and their impact on programming language storage-class semantics, 3) this architecture's impact on the apparent simplification of various traditionally-complex operating systems monitor functions, and 4) the promise this architecture holds in terms of increased functional flexibility for future-generation geodesic operating systems.

The DECsystem 10, also known as the PDP-10, evolved from the PDP-6 (circa 1963) over five generations of implementations to presently include systems covering a price range of five to one. The origin and evolution of the hardware, operating system, and languages are described in terms of technological change, user requirements, and user developments. The PDP-10's contributions to computing technology include: accelerating the transition from batch oriented to time sharing computing systems; transferring hardware technology within DEC (and elsewhere) to minicomputer design and manufacturing; supporting minicomputer hardware and software development; and serving as a model for single user and timeshared interactive minicomputer/microcomputer systems.