Action Editor Question...

I am trying to understand why some of the action editor lines associated with my bones are connected with a solid pink line while some of them are partially connected and others are not connected at all. Would someone please explain this to me? Please see the image below for more context. Thank you!

http://www.cs.sunyit.edu/%7Ebodilyw/thesis/screenies/screenie05.jpg

The solid lines indicate no change in the pose of the bone between keyframes . So all the bones that have a pink bar are bone that were not moved in that action .

Awesome! Thank you!