Button functions:

Takes you to the Parallel Books store, where you can add books to your library

 Delete a book

libraryTakes you back to the library 

libraryDisplays the table of contents, if any

   chewing gum   Turns the stretchy chewing gum overlay on

      Turns the stretchy chewing gum overlay off

mode 1Display one book per screen

mode 2Displays two books per screen

 Displays settings window

Displays a note

Displays all notes 

Switches to day mode 

 Switches to night mode. Night mode features light text on a dark background

Displays form to report an error, or contact us

 Displays help