Admin pages are often used for plugin or theme settings, and sometimes for user guide. However, there are situations you want to add a hidden admin page that only shows under a specific condition, and won't show in the admin menu. Pages such as WordPress welcome page, credit page for new versions are examples. These page are displayed only once when users update their WordPress websites and they contain only information about the new versions. Plugin authors might want to add similar pages that shows a quick start guide for users when they first install their plugins. And this tutorial will show you how to do that.
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