Returing an indicator for exclusive mode access to db

[rs0905]

This is a multi-user db. I would like a way for my code to determine if the
db is currently opened exclusively, or if there are other users using the db.
I have a cmd button that runs code which requires the db to be opened
exclusively.

Is there a line of code I can use that can return if the db is opened
exclusively or not?

maybe "If (database is opened exclusively) then...." ??

Thanks!