If you are openning up Document 2 from Document 1, then you can pass the UNID to Document 2. When Document 2 is saved you can then use the PostSave event and grab Document 1, using the UNID, and change it in the background using LotusScript. Note that if Document 1 is still open when you change the document in the background, you will have to refresh it or close and reopen it to view the changes.