This eLearning course introduces the Once-Only Technical System which lets EU public authorities securely exchange official documents and data at the request of citizens and businesses as part of cross-border administrative procedures. The course will provide context, background and definitions of the Once Only Technical System, with further sections examining the user journey, components and architecture, and things to think about when putting it into practice in cross-border public services. It will also provide an overview of supporting tools and services and a knowledge test. 

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