Navigation, access to records, and info location and retrieval are fully free and no subscription or affiliation is required. The main limit is the language, though: only few pages are translated in English
Navigation in the website and use of its materials are completely open and free to the public
All provided material and particularly the annual conference papers are fully retrievable for free by all users. Access to general info as well as research materials is without any restriction
The linking structure is quite good, with attempts to provide pertinent link lists for external e-resources, other institutions, etc. The internal links are also well nested, although not always so