Pope's Teamby J Michael Miller CSB. A description of the Vatican's Secretariat of State and its important role as the Pope's adviser in both internal and external Church affairs. (from The Catholic Answer March/April 1997).
Roman CuriaThe Pope's "Government" of Vatican City State (as Head of State) and of the Catholic Church (as Pontiff) is assisted by the Roman Curia -- the Congregations and Dicasteries set up as his "Ministries". This article explains what each of the Dicasteries is and what its role is in the governance of the Church or Vatican City State.
Vatican Diplomatic ServiceAs a sovereign State, the Holy See sends diplomatic representatives to other nations (called Nuncios) and receives Ambassadors from other countries. This article from the Vatican Information Service provides some background on the Vatican Diplomatic Service.