You can provide navigation links for readers which appear as buttons on a toolbar or as entries in a navigation menu. For works using a lot of technical terms or perhaps in an unfamiliar language, you can provide glossaries offering further explanation. Readers can invoke this by double clicking on words, or by drag selection and clicking the Glossary menu item. You can also provide a search field that is always present (and can't be scrolled away), in which readers can enter one or more keywords to search an index. These facilities can be specified explicitly using the LINK element. Implicit links allow you to define the table of contents (toc) as an HTML+ document without needing to place links to the toc in every subdocument. The link back to the toc is implied when you follow hypertext link from the toc to its subdocuments.
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