You can obtain URLs to specific chapters and sections that can be used outside of Pageflow to deep link into your stories.
Chapter Permalinks
When you scroll through a published story, the URL in the browser's address bar automatically updates as you move between chapters. A suffix in the form #chapter-title is appended to the URL. If you copy this URL, you can link directly to the corresponding chapter.
Section Permalinks
Each section also has its own unique URL. To obtain the permalink for a section, use the "Copy permalink" menu item in the context menu of sections in the outline:
The URL to the section will then be in your clipboard and can be pasted elsewhere.