Zeth Willie posts a link to the script he was using in his last tutorial Creating an IK / FK Snapping Script for a Character Rig in Maya where he was using his zbw_messageMapper to create and edit message attributes in Maya. Check out the zbw_messageMapper for Maya courtesy of Zeth Willie here.
…I know I mentioned it in the 3rd part of the IK/FK snapping videos, so here it is for those of you who might be inclined to use it, the message mapping script…
A Message Attribute is a dependency node attribute in Maya that does not transmit data, it only declares relationships between nodes. In this case the message attribute in Maya can be used to enhance the functionality of scripts for rigging in Maya were you are able to pass item, object and node names from one node down to another – essentially eliminating the need to hard-code actual names.
Maya/Rigging: IK to FK snapping, part 3 from zeth willie on Vimeo.