States as International persons — Composite and dependent States and territories — Mandated and trust territories — Rights and duties of the administering authority — Rights conferred on persons by a mandate — Whether enforceable In the municipal courts — Acquisition of control of the mandated territory — Whether an act of State — Territory of New Guinea — Mandate to Commonwealth of Australia — Whether any legal or equitable duties imposed on the administering authority as a matter of law — Power of the administering authority to Introduce a system of land title by registration — Whether any duty on the administering authority to protect native land rights — Whether native land rights inalienable — The law of Papua and New Guinea