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The IBM Enterprise Systems Architecture/370™ vastly increases the potential virtual addressability available to both system and application programs. The I/O model and the application model of permanent data are discussed to illustrate how large virtual addressability can be used to simplify application programs and improve performance. New MVS services that exploit the architecture are described. Also described are data window services, which are callable from high-level languages and provide the capability to manage very large permanent and temporary objects in virtual storage.
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