Technically speaking, there is a cookie. This is generated automatically by the Tomcat application server and nothing more than the JSESSIONID is stored in it. This session is generated on the server side when the Goobi viewer is called up and stores information such as the language selected in the user interface or whether a user has logged on. The session is deleted after 30 minutes of inactivity. The Goobi viewer also stores other data in addition to this, but in the browser session. In other words, on the user's computer and not on the server. The information stored here includes, for example, which view was selected for the search hits (details, list, thumbnails) or the zoom level and position of an image so that this information can be retained when scrolling.