In SACHA, a manifest, as defined in the Presentation API, refers to a digitized object.
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.

MANIFEST ID OR URL IIIF MANIFEST MIRADOR VIEWER MIRADOR3 VIEWER (BETA) UNIVERSAL VIEWER