They represent atomic units of work done as part of a business process.
There are three types of tasks:
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None: represents a generic task. This type of activity does not have an associated application; it is automatically executed by the engine and affects neither the relevant workflow data nor the application data.
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Script: are those activities that do not require interaction by the user and will be executed by the Workflow engine.
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User: represents a task executed by an user.
Below are examples of each one of these symbols:
