Whenever enough people start experimenting with a new photo technique, it invariably gets its own name. In this case, it's become known as "Focus stacking." The name makes sense because you use a series of three or four photos, each with a slightly different focal point, so a different part of the picture is sharp in each shot. You use CombineMZ to "stack" the photos and combine them so all the in-focus bits are merged into One Photo that is sharp from front to back. Pretty neat, right?
has one more trick up its sleeves: You can use it to make a Movie out of all the frames in your focus stack. Choose Movie, Make and the program will use each Frame in your sequence into a movie, so you can watch the focus Ripple from one end of the scene to the other--sort of like the way the focal point will change from one subject to another in a film or TV show.