<h1><span class="d-block text-primary">The Once-Only Hubhub.</span>Collaborate to build the <span class="d-block not-d-block-mobile">future of the Single Market.</span></h1>
<p class="lead">The Once-Only Technical System connects EU public authorities, so they can exchange official documents and data at the citizen’s request. It puts into practice the Once-Only Principle, which states that citizens should not be forced to provide information to authorities if another authority already holds that information in electronic format.</p>
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