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Orchestrations are like flowcharts with functional shapes, together with transaction support (atomic and long running) the Biztalk orchestration tools allow a wide range of business processes to be modelled.
Day to day business processes often involve people interacting, these interactions can be long running and difficult to consider as ever being atomic.
In such cases alternative workflows are added that allow the particular tasks to be "backed out of", thus resembling aspects of atomic transactions.
Web .Net Rules Framework using ICA (Information Caching Architecture) from Webica.Net