Appellate Tribunal procedure: guided by natural justice, not bound by civil procedure, but vested with civil court powers. Section 111 provides that the Appellate Tribunal, guided by natural justice and the Act, is not bound by the Code of Civil Procedure and may regulate its own procedure. It may exercise civil court powers-summoning witnesses, compelling documents, receiving affidavit evidence, requisitioning public records, issuing commissions, and dismissing or setting aside representations for default. Tribunal orders are enforceable as civil decrees and may be sent for execution to the appropriate local court; proceedings are treated as judicial and the Tribunal as a civil court for certain penal and criminal procedure purposes.