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When displaying a single post, you might want to show links to the previous and next posts in the same category. That’s fine; WordPress let’s you do this with previous_post_link() and next_post_link(). But what if that post is in multiple categories? What if the user came to that post from a tag page or from an author page? Wouldn’t it make more sense to display previous / next posts from that particular set? Well, you can do this with a similar pair of functions, provided by this plugin: previous_post_smart() and next_post_smart(). Here’s how it works: Whenever a visitor goes to an archive page (category, tag, date, author, search etc.), the plugin notes which archive it is in a browser cookie. Then, if the visitor goes to a single post from that archive page, the plugin generates the prev / next links based on the information in the cookie. Links: Plugin News | Author’s Site