You can export you digital “root” certificate, and import it easily in so many computers as you desire.
So, it can works in any computer over the world, always if you uses your own key, necessary to encrypt before exporting.
In addition, there is a number of companies (public and semi-public) that act as electronical identification providers.
To access to Catastro you need to have a electronical identification according to you N.I.E. if you want to see all data related to your properties.