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Bookmarks
Book readers can add bookmarks to a book to indicate their favourite pages and help them to return to those pages thereafter. Similarly, hypertext readers can use bookmarks to mark their favourite hypertext node. But the difference is that sometimes book readers cannot add as many bookmarks in a book as they can do in a hypertext environment.
In the current WWW, readers cannot determine easily whether they have already bookmarked a particular node. Weinreich suggested showing this (and other information) in pop-ups next to links:
