68It follows from, inter alia, Articles 56 and 60 of Regulation 2016/679 that, for cross-border processing as defined in Article 4(23) of that regulation, and subject to Article 56(2) thereof, the various national supervisory authorities concerned must cooperate, in accordance with the procedure laid down in those provisions, in order to reach a consensus and a single decision which is binding on all those authorities and with which the controller must ensure compliance as regards processing activities in the context of all its establishments in the Union. Moreover, Article 61(1) of Regulation 2016/679 obliges the supervisory authorities, in particular, to provide each other with relevant information and mutual assistance in order to implement and to apply that regulation in a consistent manner throughout the Union, and Article 63 of that regulation specifies that it is for this purpose that provision has been made for the consistency mechanism set out in Articles 64 and 65 thereof. Lastly, the urgency procedure provided for in Article 66 of Regulation 2016/679 permits the immediate adoption, in exceptional circumstances, where a supervisory authority concerned considers that there is an urgent need to act in order to protect the rights and freedoms of data subjects, of provisional measures intended to produce legal effects on its own territory with a specified period of validity which is not to exceed three months.
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