Bookmark.ntf is being written to. Why and What?

I have hundreds of users running on Windows Terminal Services under Citrix MetaFrame XP. Right now each of the users have their own bookamrk.ntf (and various other templates) in their home directory. We want to migrate these users to Notes 6 but have a disk space constraint. I wanted to point them to a common bookmark.ntf to save space. But I discover that Notes wants to update the bookmark.ntf. Does anyone know why Notes would want to update the template and what it is changing?

Subject: RE: Bookmark.ntf is being written to. Why and What?

For example: View indexes, Unread marks