This can be done with the "on open" trigger in the document properties tab "triggers"
If you catagoricaly know that every user will use BM01 as the id for the bookmark then you can go ahead and hard code the trigger to default to BM01 on open, otherwise you would need to maintain a table of windows usernames and bookmark id's
You can use the "OSUser()" function to find out who is opening the document then return the correct bookmark ID for use in the trigger.
