Yes, I know.  Here's what I'm trying to accomplish. I have a document that
has some pieces of data that are bookmarked, in addition to a lot of other
text.

The document is not protected so the user can edit/append, etc.  
Periodically, the bookmarked pieces of data are replaced with updated text,
which is taken from another application.  I have a macro that does this -- it
searches for the bookmarks and replaces the data within the enclosed bookmark
with updated data.

However, I have run into a situation where the user sometimes accidentally
deletes the bookmarks so when the update is attempted, via a macro, and the
bookmark doesn't exist, the update cannot continue.  Any ideas for a better
way to accomplish this task?