You can create new pages between any existing pages, or at the start or end of an existing book.
You can create new books in an existing database of books.
You can export your database to the SD card downloads folder, containing all your pages and including any edited text as an SQLite file, and can then open it with any SQLite explorer.
You can distribute these files to any other user of Handbook for use with Android or on a desktop system.
You can import other existing books that have been created in the Handbook format.