79D. (1) A person who is registered as a user of a ¹[Customs computer] system shall be allocated a unique user identifier for use in relation to that ²[Customs computer] system by the Commissioner of Customs, in such form or of such a nature as the Commissioner of Customs may determine. (2) The unique user identifier allocated pursuant to sub-section (1) of this section shall be used by the registered user for the purpose of transmitting information to or receiving information from that ³[Customs computer] system. (3) The Commissioner of Customs may, by notice in writing, impose conditions and limitations on a particular registered user, or on registered users generally, relating to the use and security of unique user identifiers.