Read Aloud with ADE 3.0 on Mac OS X with Voice Over

From your book Getting Started with Adobe Digital Editions, with my questions in italics after:

When using Mac OS X's VoiceOver screen reader (for accessibility), press Ctrl+Option+W to read the contents of dialogs.  What are accessibility and dialogs?

When using Mac OS X's VoiceOver screen reader (for accessibility), Digital Editions will not support navigate and read by paragraph, line, word, or character.  What does it mean that it doesn't support navigate and read by paragraph, line, word, or character?

Voice can read your sample books only if I highlight the section and then use the Voice Over command.

Voice cannot read the ePub books from the Open Library.  Welcome to Open Library (Open Library)