1. A method for operating a data processing arrangement on which an application platform is implemented along with at least one application, the at least one application being executable on the application platform by accessing at least one programming interface of the application platform, the method comprising: carrying out, in the course of a change of version of the application platform or of a part of the platform, a check by an update module to determine whether a newly-to-be-installed more recent version of the application platform or part of the platform is consistent with an existing relatively older version of the application platform or part of the platform in terms of at least one of an interface specification and behavior of the at least one programming interface; and at least one of overwriting, via the update module, the existing relatively older version with the more recent version where appropriate, and otherwise, if not appropriate, installing the more recent version or at least its programming interface, in parallel with the existing relatively older version or its programming interface.