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<h2>Common and supporting services</h2>
<p>To provide comprehensive support and proper exchange of evidence between Data Services and Online Procedure Portals, the Once-Only Technical System uses Once-Only common services and additional supporting services.</p>
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<h2>Technical design<br>design documentation</h2>
<p>The technical and operational specifications of the Once-Only Technical System, are complemented by detailed, non-binding technical design documents jointly prepared by the Commission and Member States.</p>
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