To page forward or back:

With two books on screen:

1> Swipe left or right on a book to page forward or back, the other book will follow as required (note: only the book that you swipe on is guaranteed to move exactly one page, the other book will move as far as required to keep its content parallel).

2> Tap on the right or left edge of the screen to page forward or back the left book. note: (only the left book is guaranteed to move exactly one page, the right book will move as far as required to keep its content parallel).

With a single book on screen:

1> Swipe left or right on the book anywhere other than the side which is closest to the other book to page forward or back the book currently on screen, the other book will follow as required.

2>Tap on the right or left edge of the screen to page forward or back the book that is on screen, the other book will follow as required.