I downloaded UT3_Male from http://udn.epicgames.com/Three/UDKCustomCharacters.html, and Biped rig(bip_root) is included with some of the skeletons(b_root), but it makes me really confused. In the file, bones are attached or linked to biped somehow, but I have no idea how to make a rig like this. It looks like there's no Skin modifier on b_root(bone), and I don't think it's connected with link constraints either.
So how are bones and biped connected together in this file? any ideas?