Once a court has pronounced a final judgment or order, it becomes functus officio and has no authority to correct, alter or supplement it, except in the limited circumstances contemplated by rule 42 (clarification of ambiguity, correction of clerical errors, or supplementation on accessory matters such as costs). An order made by a court without jurisdiction is a nullity. When no live dispute or lis exists between parties because the final word has been spoken on the matter and it is not susceptible to alteration on appeal, an appellate court has no jurisdiction or discretion to entertain the appeal. An appellate court will not exercise its jurisdiction when any judgment on appeal would have no practical effect or result as contemplated in s 16(2)(a)(i) of the Superior Courts Act 10 of 2013.