The President of the Senate receives no special treatment in the sessions of Senate. However, in the official communications the President holds the title of Excelencia ("Excellency"). The President is elected among current senators by the members themselves, and forms the Mesa de la Corporación (Committee of Chambers of the Congress) along with the Senate's Vice President.
The President's responsibilities include decreeing the summons to the Senate for its sessions, presiding over sessions and directing the debates on the Senate floor, acting as a representative of the Senate by defending its parliamentary jurisdiction and dignity, and presiding over the sessions of the Congreso Pleno (plenary meeting of both chambers).
República de Chile (1942). "VII. Nómina de ciudadanos que han formado los senados de Chile". Manual del Senado. 1810–1942(PDF) (in Spanish). Santiago de Chile: Imprenta Universitaria. (in Spanish)
Valencia Avaria, Luis (1986). Anales de la República: textos constitucionales de Chile y registro de los ciudadanos que han integrado los poderes ejecutivo y legislativo desde 1810 (in Spanish) (2ª edición ed.). Santiago de Chile: Editorial Andrés Bello. (in Spanish)