Working with catalogs on a server
If you work with catalogs on a server, it is possible that you, or another user, may attempt to access a catalog that is already in use. To prevent this concurrent access, Microsoft Expression Media uses a catalog-locking feature. As long as a user keeps a catalog open, Expression Media informs any additional user who is trying to open that catalog that the catalog is currently in use. Expression Media will then give the additional users a choice of either opening the catalog as a read-only file, or aborting the open process. When the first user closes the catalog, Expression Media displays a dialog box that informs that user which other users tried to open the catalog.