1. Whenever the construction of a convention to which states other than those concerned in the case are parties is in question, the Registrar shall notify all such states forthwith. 2. Every state so notified has the right to intervene in the proceedings; but if it uses this right, the construction given by the judgment will be equally binding upon it. Article 64 Unless otherwise decided by the Court, each party shall bear its own costs. CHAPTER IV ADVISORY OPINIONS Article 65 1. The Court may give an advisory opinion on any legal question at the request of whatever body may be authorized by or in accordance with the Charter of the United Nations to make such a request. 2. Questions upon which the advisory opinion of the Court is asked shall be laid before the Court by means of a written request containing an exact statement of the question upon which an opinion is required, and accompanied by all documents likely to throw light upon the question. Article 66 1. The Registrar shall forthwith give notice of the request for an advisory opinion to all states entitled to appear before the Court. 2. The Registrar shall also, by means of a special and direct communication, notify any state entitled to appear before the Court or international organization considered by the Court, or, should it not be sitting, by the President, as likely to be able to furnish information on the question, that the Court will be prepared to receive, within a time-limit to be fixed by the President, written statements, or to hear, at a public sitting to be held for the purpose, oral statements relating to the question.