It is filled in with a sample setup which can be used almost as is, or can be modified as you want. Before setting it up though, it's a good idea to understand what is going on. A sample file called prepend.php3 is included in the distribution, which can be required at the top of each file to include all of the other needed files. This initializes the features that you plan on using, more on this later. The values are the names of the classes you create in your local.inc.
Output can be anything from html to blank lines.
Check your local.inc or prepend.php3 for blank lines at the end with vi, or another editor which will show you these. All Rights Reserved.