You could either:
• create a FilePrint sub (which intercepts the File|Print command) to update the fields before opening the Print dialogue; or
• use Word's DocumentBeforePrint event to update the fields.
In either case, the macro could call the Document_Open sub, or you could put the code from that into a separate macro (which you could run via Alt-F8) and also call by both the Document_Open sub and whichever of the others you want. For an overview of using Document events, see: http://word.mvps.org/FAQs/MacrosVBA/AppClassEvents.htm

__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]