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Legal functions — The Legal Bureau provides advice and assistance to the Secretary General and through him to the various bodies of the Organization and to ICAO Member States on constitutional, administrative and procedural matters, on problems of international law, air law, commercial law, labour law and related matters. It includes research and studies in the field of private and public international air law regarding items on the General Work Programme of the Legal Committee and preparation of documentation for the Legal Committee, Diplomatic Conferences, Council, its subordinate bodies and the Assembly.

The Legal Bureau is responsible for the depositary functions of ICAO under several treaties, as well as the registration of agreements or arrangements pursuant to Articles 81 and 83 of the Chicago Convention.

The functions of the Legal Bureau also include cooperation and coordination in legal activities with the United Nations and other international organizations.

External Relations functions — The External Relations is responsible for reviewing, advising on and coordinating ICAO's relations with Contracting and non-Contracting States, the Organizations of the United Nations Common System and with other international organizations.

The Office monitors activities of the international system which are of mutual interest to ICAO, the United Nations and other international organizations, directs attention to international affairs and political developments which may affect ICAO, and makes arrangements for the representation of the Organization at meetings of other organizations.

The Office also provides policy guidance and advice on matters relating to the privileges and immunities granted to the Organization, national representatives and staff of the Secretariat. It acts as the focal point for ICAO's relations with the Host States of the Organization's Headquarters and of the Regional Offices.

The Office is responsible for arranging and supervising the ICAO Familiarization Course.

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