Questioning about Rigging.

Today, for one of our classes, we looked into a modifier called CATRIG which is a automatic walkcycle for rigged characters. We generally are supposed to build a skeleton from the CATRIG that connects to the platform and from that it automatically walks in place or walks along. I found this task quite enjoyable because I didn't know what there was this kind of option in 3D Max. We had to use a skeleton that was supplied to us by the CATRIG and modify the body parts to create our own character walkcycle. This method seemed very helpful towards our project for whenever I need to animate my character further on.