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Virtue is a virtual session manager running under IBM's VM operating system. [1]
| This article has multiple issues. Please help improve it or discuss these issues on the talk page . (Learn how and when to remove these messages)
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Virtue is a virtual session manager running under IBM's VM operating system. [1]
Virtue, short for "virtual tube", was the first session manager commercially available for the VM environment on IBM mainframes. The product allows users to use a standard 3270 monitor to control multiple sessions, whether VM/CMS, DOS/VSE, z/VSE MVS, z/OS, or other operating systems or applications such as CICS, Westi, or DUCS sessions. Virtue runs as a highly privileged CMS task, designed to accommodate model IBM 3270 monitors and their descendants. [2]
Product development occurred at III offices within Westinghouse Automation Intelligence division, Orlando, Florida, United States. Broad range in-depth testing was conducted at IBM's data center in Tampa, Florida, and the IBM lab in Böblingen, Germany. Although the package nominally ran as a highly privileged CMS session and utilized CMS services, it deployed an internal multitasking mechanism called a "subvisor", which queued and prioritized tasks to be done. [2]
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