The principle functions of a Notary Public are to:
The duty of a notary is to the transaction as a whole, and not just to one of the parties. In certain circumstances a notary may act for both parties to a transaction as long as there is no conflict between them, and in such cases it is his or her duty to ensure that the transaction concluded is fair to both sides.
A notary will often need to place and complate a special clause onto or attach a special page (known as an eschatocol) to a document in order to make it valid for use overseas. In the case of some documents which are to be used overseas it may also be necessary to obtain another certificate known either as an "authentication" or an "apostille" from the Department of Foreign Affairs and Trade.