{# The rest of the course, beside the page being read. A lab script is read end to end and then leaves the reader with nowhere to go but the back button. These two put the course back within reach without taking the page's own width away from it: everything the course holds, and what has moved lately. Both are always about the course the current page belongs to, which is the only course a reader standing here is thinking about. Nothing here decides visibility. What arrives has already been through the same per-reader check the pages themselves go through, so a section released next Monday is not announced by name in a navigation panel. #}