The opening screen had a single hotspot, a box about 150 by 120 pixels sitting just below the middle of the slide, and it led to Slide 2. There was nothing else to click. A first screen with one obvious next step is still good practice: the viewer learns how the prototype works before they have to think about where to go.
The frame above is drawn at the original proportions. Each dashed box sits where the 2009 hotspot sat and links to the same screen it did then, so the tour can still be walked end to end.