While reading your book, you may notice icons in the right-hand margin. For example, you may see one of these icons:
Hovering your mouse over these icons will highlight the selection on the page to which the icon is related.
In order to access the associated comment or link, click on the arrowin your left-hand toolbar, then click on the selection on the page. Be aware that a comment or link can be associated with text, as well as an image on the page.
Clicking on a comment will launch a comment window.
Clicking on a link will launch the linked URL in a new browser tab.