You may log in as another user without exiting and restarting the program. You will be asked for a new user name and password. You may then continue working with the access rights of the new user.
CAUTION: This is often the source of a security breach. If you log in at another workstation in order to temporarily get increased access rights at that workstation, be sure to either log back in as the original user, or exit the application when you are finished.