Word VBA question - How do I return a document to it's original content?

Hi,

I am having major difficulty doing the following and any help would be much appreciated:

1) User opens a word document.
2) The document is somehow bookmarked with it's original content.
3) Upon saving the document, a macro makes a bunch of changes to the document.
4) When finished saving, I need the macro to then return the document to it's original content when first opened.

Any ideas on how to achieve 2-4?

Many thanks :)

Make the document Read-only and force the user to save it under a different name.

Other then that, there is document tracking in Word.....never used it tho, so I don't know if that would help.