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'''Shared Variables''' are a feature of the programming language [[APL (programming language)|APL]] which allows APL programs running on one [[Processor (computing)|processor]] to share information with another processor.<ref name="ency">{{cite book
|title=Encyclopedia of Microcomputers
|year=1987
|
|isbn=0824727002
|chapter-url=https://books.google.com/books?id=F-Y0wdIIucgC&pg
|pages=
|chapter=APL for Microcomputers}}</ref> Although originally developed for [[mainframe computer]]s, Shared Variables were also used in [[personal computer]] implementations of APL.<ref name="ency"/> Shared Variables could be used to control [[peripheral device]]s, or to communicate with external files, [[database]] management systems, or other users.<ref name="ency"/> Shared Variables were first introduced by International Business Machines Corporation ([[IBM]]) in their APL.SV [[software]] product in 1973,<ref name="design">{{cite journal
|journal=IBM Journal of Research and Development
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|author1=A.D. Falkoff
|author2=K.E. Iverson
|pages= 324–334
|doi=10.1147/rd.174.0324
|url-access=subscription
}}</ref> and are still available {{as of|2017|lc=y}}, in APLs from IBM and Dyalog,<ref name="dya15">{{cite web
|url=http://help.dyalog.com/15.0/Content/InterfaceGuide/Shared%20Variables/Shared%20Variable%20Principles.htm
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* Full Screen Display Manager (AP124)
* IBM [[Graphical Data Display Manager]] (GDDM) (AP126)
* [[IBM
==Subsequent uses==
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