The links are, as it were, deferred or floating. To move to a new passage, the reader should try clicking on one of the four graphic images of text in the outer frames. However, this may simply reload the current passage in the central frame. To be sure of moving on, you must click on one of the images in the central frame. This will usually (but not always, the piece has a topography, though one of the four will always yield) replace the graphic text in the nearest outer frame so that when you then click on that, you move to a new passage in the central frame. However the other three outer frames will remain unchanged. In a sense the links associated with a previous passage are still accessible from the new passage and are now associated with it (in a configuration which may not have been indeed, it is unlikely to have been anticipated by the pro-author).