This refers to the links at the top of the screen that take you back one step at a time to other areas of Moodle. When Emma accesses the Orientation quiz, this is how the breadcrumb trail appears:

So she can move back to the topic (Topic 1-First Steps in French) or she can move back to the course itself (French for Beginners) or she can go back to the front page (Home) She can't directly, from the navigation bar, go to a different course, although she is able to do this from the Navigation block we've been investigating.