The document discusses indirect object clitic doubling constructions in Spanish and other languages. It proposes that these constructions involve an applicative head (Appl) that licenses the indirect object in its specifier position. This relationship between the indirect object and Appl allows Appl to form the basis for the clitic. The presence of Appl gives these constructions properties of both prepositional dative constructions and double object constructions, such as binding asymmetries and scope freezing effects.