Some words about the Catalogue – words, you might not find anywhere else:
Please DO NOT USE the "back arrow" or "forward arrow" of your browser. If you do, the effect might be surreal.
Please USE the "back arrow" or "forward arrow" on the Catalogue desktop.
Further information you may find on the Catalogue Desktop with the Help button (in the English version of the catalogue) or the Hilfe button (in the German version of the Catalogue).