A chamber application that is to be served on an interested party must be in the prescribed form (Form 29) as required by Rule 241(1), and failure to use the correct form renders the application defective and liable to be struck off the roll. A certificate of urgency must demonstrate that the certifying legal practitioner properly applied his or her mind to the essential elements of urgency, including when the need to act arose, irreparable harm, balance of convenience, and lack of alternative remedies. Merely rubber-stamping or repeating the applicant's averments in the founding affidavit is insufficient and will result in the matter being struck off the roll of urgent matters.