While holding the left mouse button and dragging the cursor left or right, you can have a panorama view.
When you guide your mouse cursor over a hotspot, you get some brief informations. Most of the hotspots are linked to the next point of the virtual tour or more information.
Please follow the labels and signs for orientation. Class-marks of the textbook collection start with LN.
The context of textbooks is listed in the subject index ("Bestandliste": German, PDF).