Shared Variables
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Shared Variables are a feature of the programming language APL which allows APL programs running on one processor to share information with another processor.[1] Although originally developed for mainframe computers, Shared Variables were also used in personal computer implementations of APL.[1] Shared Variables could be used to control peripheral devices, or to communicate with external files, database management systems, or other users.[1] Shared Variables were first introduced by International Business Machines Corporation (IBM) in their APL.SV software product in 1973,[2] and are still available as of 2017[update], in APLs from IBM and Dyalog,[3] for the operating systems Linux and Windows.