Attached Link: http://www.renderosity.com/messages.ez?ForumID=12368&Form.ShowMessage=1958980

The way to think of a HDRI file is THIS: It's like a VUE ATMOSPHERE with a SUN. The difference is that the HDRI file totally REPLACES the Vue Atmosphere and Sun and provides it OWN UNIQUE atmosphere and light source. That's why each HDRI file is different and each creates a different look in your image. Here's the thread where I discribed how I did "My First HDRI Image" in Vue 5. The thread also tells you where to load the file and adjust the dome lighting...