A digitized object can be a book or a similar object from the library(newspaper, magazine). Every manifest has a unique id, which is its URL. Every digitized book has a project name unique id. The project name and the id are included in the manifest URLs in the following scheme:

http://iiif.onb.ac.at/presentation/{project name}/{id}/manifest/

There are currently three digitization projects with the following names: ABO(Austrian Books Online), ANNO(AustriaN Newspapers Online) and AKON(AnsichtsKarten ONline). You can either type in the full URL or just the id(project name will be inferred) of a digitized book in order to view it. SACHA provides two viewers to view the manifests: Mirador and Universal Viewer. You can also view manifests from institutions other than the Austrian National Library by typing the URL. For more information, you can read the documentation.