What are they and what do they do?

I thought that is what the Mshs that are found in their animation bank held that stuff.

And those meshes get munged into .anims

.anims - defines what animations were pre-munged in the .zaabin file
.zaabin - contains pre-munged animation data
.zafbin - contains pre-munged skeletal data(basepose.msh)

Cool! Thanks guys.