# Another book...

Here's another book to demonstrate that

- You can display multiple books in a help controller
- You can selectively search books. Try it!
- Index files are optional. This book doesn't supply an index, but it does supply a contents (.hhc) file. You must always supply a contents file because
  - Contents trees rule :-)
  - The search algorithm uses the contents tree to find out which pages are available.
  Wanna know what a contents file looks like? Click here

You can also view the project file for this book.