A Master Shell a course environment an instructor uses to develop and maintain course materials that are used from semester to semester. Is not tied to CampusNet. Therefore, no students or other users are enrolled into this shell. This shell can be used as a "master" where one keeps permanent changes to a course. Faculty may copy content from a Master Shell into a Production Shell as long as they are enrolled as a course designer or instructor in both shells. Master Shells are not deleted except upon the request of the instructor or when they leave CSU employment.