Personal Data Protection 25 Register of Data Users 20. (1) The Commissioner shall maintain a Register of Data Users in accordance with section 128. (2) The Register of Data Users shall contain the names of data users who have been registered in pursuance of this Division and any other particulars regarding such data users as may be determined by the Commissioner. Division 3 Data user forum and code of practice Data user forum 21. (1) The Commissioner may designate a body as a data user forum in respect of a specific class of data users for the purposes of this Act by notifying that body in writing, if the Commissioner is satisfied that— (a) the membership of the body is open to all data users of that class; (b) the body is capable of performing as required under the relevant provisions of this Act; and (c) the body has a written constitution. (2) The body shall agree in writing to be a data user forum before the designation is registered by the Commissioner in the Register of Data User Forums. (3) The Commissioner may decide that an existing body that was previously designated as a data user forum under subsection (1) is no longer a data user forum for the purposes of this Act, if he is satisfied that the body no longer meets the requirements as set out in that subsection. (4) Where the Commissioner decides that an existing body which has been designated as a data user forum is no longer a data user forum for the purposes of this Act, he shall withdraw the designation and subsequently cancel the registration of the designation in the Register of Data User Forums.