If you're need to fill up the footer with the version number or the author of the file, or some other metadata- quick parts are what you are after Janis Hall has a good clear description
this is very good stuff http://www.u2u.info/Blogs/Kevin/Lists/Posts/Post.aspx?List=6f246d9a-e4e7-4846-b776-f9a62112ffb7&ID=15
and here is a video of related tricks
http://blogs.msdn.com/microsoft_office_word/archive/2007/01/18/xml-mapping-with-word-sharepoint.aspx
And there's more,here is the opportunity to tweak the DIP Document Information Panel you can use infopath http://msdn.microsoft.com/en-us/library/ms545650.aspx
