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System V Release 4

(SVR4)

 Developed jointly by AT&T and Sun Microsystems

 Combines features from SVR3, 4.3BSD, Microsoft Xenix System V, and

SunOS

 New features in the release include:

 real-time processing support

 process scheduling classes

 dynamically allocated data structures

 virtual memory management

 virtual file system

 preemptive kernel