If you want to consult the Digital Library from outside the UPF you need to use the SARE.
 
The connection to the SARE is automatically activated from the links to e-resources that are on the Library and Computer website. You have to authenticate with the Campus Global code and password when it asks for it.
 
If you access from the results page of an external search engine (eg, Google) or from a shortcut or bookmark, you need to install the SARE button in your browser.