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Concept: Workflow engine

Program that manages all running workflows
The workflow engine tracks workflows, starts activities, waits for asynchronous actions and follows transitions.
Workflows require activities to happen asynchonously. For example, a user might take a while to respond to a question. The engine is always running and listening to responses, once received a response is passed on to an activity instance for processing.

The workflow engine runs as NT service.

See also: Workflow instance, Activity instance