Appellate Tribunal procedure: guided by natural justice and vested civil-court powers to regulate appeals and enforce orders. Section 111 permits the Appellate Tribunal to depart from the Code of Civil Procedure while being guided by the principles of natural justice, to regulate its own procedure and to exercise civil-court powers-including summoning witnesses, compelling document production, receiving affidavit evidence, requisitioning public records, issuing commissions, and dismissing or setting aside representations. The Tribunal may enforce its orders as civil decrees through local courts and its proceedings are treated as judicial proceedings for specified penal and criminal procedure provisions.