Eclipse is very simple to use. In order for Eclipse to do its job, it simply needs to be running on your machine. After your machine sits idle for the set amount of time, Eclipse will dim your screen and display your graphics or the time.
When you run Eclipse for the first time, you have the opportunity to create a startup document. This document is placed in your Startup Items folder, and every time your computer starts up, Eclipse will automatically be launched.
Aside from this very simple setup, Eclipse can be configured from the Preferences dialog box. From here you can configure all of the settings for Eclipse. For details about the Preferences dialog box, please consult the Eclipse Documentation included with the Eclipse archive.