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The Job of the Region Parameter

The region parameter acts as a go-between from the page parameter to the task flow. It takes the value stored in the page parameter, accessed as a value in the page’s binding container, and stores it in an output parameter, which should have the same name as the input parameter of the task flow. Now the task flow is able to receive that value and store it in the page flow–scoped variable that can be used anywhere within that task flow.