A Writ of Prohibition is issued primarily to prevent an inferior court or tribunal from exceeding its jurisdiction in cases pending before it or acting contrary to the rules of natural justice. It is issued by a superior court to inferior courts from usurping a jurisdiction with which it was not legally vested, or in other words to compel inferior courts to keep within the limits of their jurisdiction. Thus the writ is issued in both cases where there is excess of jurisdiction and where there is absence of jurisdiction The writ can be issued only when the proceedings are pending in a court if the proceeding has matured into decision, writ will not lie.