International organizations — Immunity — Jurisdictional immunity — Foreign national employed as secretary by international organization — Contract of employment — Dispute — Whether subject to jurisdiction of national courts — Absence of any headquarters agreement governing the position — Whether international organization under any duty to establish administrative tribunal to settle such disputes — Whether entitlement of international organization to jurisdictional immunity dependent upon establishment of such a tribunal

International organizations — Immunity — Jurisdictional immunity — Scope — Whether absolute — Whether having erga omnes effect for third States — Whether scope of immunity dependent upon headquarters agreement or rule of customary international law — Whether immunity in private contract disputes dependent upon establishment of an internal dispute settlement procedure — The law of Switzerland