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(allowing system calls to be processed from any processor, but interrupt servicing only from a "master" processor).

Release 4.1 ES (Enhanced Security) added security features required for Orange Book B2 compliance and Access Control Lists and support for dynamic loading of kernel modules.

SVR4.2 / UnixWare

In 1992, AT&T USL engaged in a joint venture with Novell, called Univel.

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