These scenes take advantage of some of the advanced lighting features in Bryce 7 Pro and can be very CPU intensive!
On a P4 3.4ghz final renders could take as long as two hours, on an i7 system 12 minutes. Not all the scenes are this processor intensive but fair warning should be given, don't expect instant results.
There are 10 scenes, two for each of Bryce generated heightmap employed demonstrating various strategies. These are intended for the kind of people who can learn the most from taking things apart and have a good understanding of Bryce, they are not really intended for beginners.
Most but not all of the scenes make use of hdri, some employ IBL others True Ambience, often, but not always supplemented by other types of light sources.
More information on Terrain Editor Techniques is available in this forum thread in the form of a three part video. Although it is not required viewing to make use of this product, you may be interested to learn more.