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The order of modules is called Flow and the software runs through the flow in a top-to-bottom direction. You can see the flow of modules in the graph available under Modules option. There you can also see which modules are active/inactive and their processing time.
By clicking on the Edit button, the flow can be configured, you can add modules by using + button on a desired position, which shows the following pop-up window, containing brief information about each module:
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Modules communicate between them via/wiki/spaces/KB3141/pages/533529551. Context.
By clicking on the Show module flow button in the top right corner the Flow will be visible even after clicking on the specific module.
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