If you are interested in a document (book, journal article, videotape, etc.) which is not available in the UPF Library, you may check if the document is available in another Catalan university library through the CCUC (University Union Catalogue of Catalonia). This catalog includes electronic forms that allow automatic interlibrary loan applications, so you don't need to write or retype the data because they are automatically included in the form by the system. Moreover, you may consult as well REBIUN (Catálogo Colectivo de Red de Bibliotecas Universitarias Españolas) and other library catalogs.
In any case, in order to request any document not available at the UPF Library, regardless of having localized it in another library or not, you can apply for it through the Interlibrary loan service by using the ILL: requests, consults and prodeduresapplication.