(a) The United Nations may establish and operate the registered office: (e) The Secretary-General, at the request of the competent United States authorities, shall meet with those authorities to make arrangements for the registration of the arrival and exit of persons to whom a visa is valid only for transit to and from the district and their stay in that region and in its immediate vicinity. (f) The United Nations shall have the exclusive right, subject to the abovementioned provisions of this Section, to authorize or prohibit the entry of persons and goods into the district and to impose conditions under which persons may remain or stay there. 4. point-to-point communication facilities of the same magnitude and under the same conditions as those provided for in the rules and regulations applicable to amateur operations in the United States, except that such rules and regulations may not be applied in a manner inconsistent with the inviolability of the district referred to in section 9(a); The competent United States authorities shall take all appropriate measures to ensure that the equipment of the headquarters is not affected and that the purposes for which the district is necessary are not hindered by the use of the country in the vicinity of the district. For its part, the United Nations shall take all reasonable measures to ensure that the use by the United Nations of the property does not adversely affect the amenities of the land located near the constituency. ABS. 2. For the purposes of fulfilling the obligations of the United States under this Agreement and supplementary agreements concerning united States assurances that the United Nations will not be expropriated from its property in the district and with respect to the installation of radio equipment and the possible establishment of an airport, the Secretary of State of the United States, After consultation with the competent authorities of the State and City of New York, signs, on 26 June 1947 at Lake Success, New York, on behalf of the United States, an agreement with the United Nations on the headquarters of the United Nations, which shall be incorporated therein; and, in the case of the United Nations, there are a number of headquarters agreements, as a number of funds, programmes, specialized agencies, secretariats and tribunals have offices at sites around the world. . . .