PDF is the only way to view a complete "Book." But Indesign is designed only to generate single-page PDF's. That is fine for final output for print production, when one needs a single-page document. But it fails during the design process, when one needs to show the clients a whole book (with complex visual/verbal design) as spreads. What happens now is that a left-hand chapter-ending page will appear as a single page in a spread-displaying PDF. And the right-hand chapter-beginning page will appear as a single page. The internal pages of the chapter will display as spreads. The PDF looks like a game of Dominoes. This is not useful. I made my first "Book" today trying to gain the benefits of the "Book" option (page numbering, styles management, chapter-based creation-and-approval). But after three long tech-support calls, I have given up. I will not be able to use the "Book" function. It does not appear to be functional. I will go back to making a book that is one single Indesign file. If you decide to code for spread-display of "Books" please let me know. "Books" could be a very useful feature if it worked. Thanks.