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The Saarland University and State Library blog places cookies in the browser only when the user is searching the site. Browsing and reading is possible without cookies.
The Lending OPAC (when you access your online user account) sets a cookie called "CSPSESSIONID-SP-80-UP-libero-" for all visitors. It is used to provide logged-in users with certain services that require information from the user account (list of borrowed books including due date, renewal option, password change, etc). The same information is available offline at the circulation desk, ensuring a cookie-free alternative.
The SaarDok archiving platform uses a cookie for each visitor in order to provide appropriate functionality (if needed) to authenticated users. This cookie is automatically deleted by the browser after it is restarted and is generated completely anew when the user visits again, so that it is not possible to track a user's activities over a longer period of time.