It is an informal

record of the interview.

It is a letter informing the counterpart(s) that the sender no longer wishes to maintain an

agreement or a treaty. 

This is a document given by the president accrediting one

or more persons to represent him or the government in an international conference,

convention, negotiation or expressing the consent of the state to be bound by a treaty, or an

agreement.

A document that gives an authorization to consuls by the governments to which they are sent,

permitting them to carry out their consular affairs.