Volume Lighting in Volume Fog

Is there a more detailed example or explanation for setting up Volume Lighting in volume fog?

This example shows what can be done, but not sure what is being shown.
1.) Is the "smoke" layer that's being re-lit a particle system, or some kind of elaborate noise setup being fed to the the volume fog?
2.) Does a full 3D scene need to be fed into the volume fog to use Volume Lighting? I've tried using the option in volume fog that uses lighting, but can't actually get the Volume fog lit with the lights in my scene.

This example shows what can be done, but not sure what is being shown.
1.) Is the "smoke" layer that's being re-lit a particle system, or some kind of elaborate noise setup being fed to the the volume fog?
2.) Does a full 3D scene need to be fed into the volume fog to use Volume Lighting? I've tried using the option in volume fog that uses lighting, but can't actually get the Volume fog lit with the lights in my scene.