Many new multi-microprocessor systems are available or have been announced to the market. A method of structured operating-system construction to present a distributed hardware environment as a single computer to the user is proposed. Unlike many existing distributed operating systems, which are parallel and process-oriented, the new approach is based on a hierarchical structure of layers. The concept permits the designer to establish almost any dependencies between local operating systems. A

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... stribution of UNix-like systems in a heterogeneous multi-microprocessor -environment-is proposed. _ . ---