In any matter pending in a superior court, promptly upon agreeing to represent any client, the new attorney shall notify the appropriate calendar clerk in writing (and, in criminal actions, the district attorney; and, in civil actions the opposing attorney(s)) of the fact of such representation, the name of the client, the name and number of the action, the attorneys firm name, office address and telephone number.

Each such attorney shall notify the calendar clerk (and, in criminal actions, the district attorney; and, in civil actions, the opposing attorney(s)) immediately upon any change of representation, name, address or telephone number.