The various approaches can be summed up in four main integration styles. File Transfer (43)—Have each application produce files of shared data for others to consume and consume files that others have produced. Shared Database (47)—Have the applications store the data they wish to share in a common database. Remote Procedure Invocation (50)—Have each application expose some of its procedures so that they can be invoked remotely, and have applications invoke those to initiate behavior and exchange data. Messaging (53)—Have each application connect to a common messaging system, and exchange data
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