Out in the Field (Code)
http://blogs.msdn.com/microsoft_office_word/archive/2008/08/14/out-in-the-field-code.aspx

Microsoft
2008

Abstract:

Field codes provide a way to customize your Word document manually. That sounds like hard work, but the field codes also give you an inside look at some of the ways that you can customize a page number or a table of contents. (Really—those are fields.)