That's a mouthful. Basically, this is a kind of addendum to the last post about animated textures. . . Similar, but different.
The idea is that you can add cool little details to your character (or whatever) using bump and/or normal maps. But you may not want these details all the time (think frown lines on a forehead, or muscle striations on a character when he flexes his muscles). So the trick is to hook the texture up like you would a pose space deformation, only being activated when you want it to be, in certain poses.
This is NOT so much about creating bump and normal maps, just about how you'd use them in this scenario.
Maya/Rigging: Using "Animated" Bump and Normal Maps from zeth willie on Vimeo.