Update is the process of refreshing your current project version by merging changes that other team members have made and committed previously to the server. You should update a project when you know that a new project version is available on the server.
To update the project with changes from CEDW
From the Collaborate menu, select Update Project, or press Ctrl+U.
Locked items cannot be updated.
A special case of the update feature is updating the lock information. Use it to refresh the list of elements that are locked by other users.
To update the lock information on elements locked by other users
From the Collaborate menu, select Update Lock Information, or press Ctrl+Shift+U.