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With the composer it is possible to edit parts in an application when running in runtime. For instance, the label of an attribute, the label of a button or a container name can be changed. In a lot of cases it is not desirable to do this change on a production environment. This is solved by using an extra environment called 'staging' (which is placed between the acceptance and production environment). On this environment the change is performed and can be put live by using the publisher.
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