A chamber application for leave to appeal remains a chamber application and must comply with rule 241 of the High Court Rules, 1971, including the proviso requiring that where such application is to be served on interested parties, it must be in Form 29 with appropriate modifications, not Form 29B. The specificity of rule 263 does not displace the general requirements of rule 241. Rule 263 contains peremptory provisions (using the word "SHALL") that must be complied with, requiring the application to state: (1) the reason why application was not made in terms of rule 262; (2) the proposed grounds of appeal; and (3) the grounds upon which it is contended that leave should be granted. A failure to comply with peremptory provisions of the rules of court renders an application fatally defective and a nullity. The notice in an application serves important purposes: it informs the respondent of the steps required to oppose the application, places the onus on the respondent to file and serve papers within a given period, provides the applicant's address for service, and informs the court and Registrar of the requirements placed upon the respondent.