By Nicole Winfield What is a conclave? VATICAN CITY (AP) — A conclave is the centuries-old election of a pope that derives its name from the Italian “con clave” (with a key) to underscore that cardinals are sequestered until they find a winner. Cardinals have no contact with the outside world after the master of liturgical ceremonies utters the words “Extra Omnes” the Latin phrase for “all out,” to ask all those present except the cardinal electors to leave the Sistine Chapel to begin the voting process. In between votes, the cardinals will be staying at the Domus Santa Marta hotel in Vatican City and possibly another nearby Vatican residence, since there are more cardinal electors than Santa Marta hotel rooms. How will it work? The conclave begins May 7,…