A shared user is a user that has been added to a case by the case owner, or possibly by another shared user, and who has been given a specific set of privileges as it relates to the case. For example, a shared user may be granted a single privilege of uploading studies to the case and being restricted in having the right to view only those studies he/she has uploaded.
Shared users can be also be added with full permission to perform all of the tasks that the case owner can do. This is useful when an attorney wants to give a paralegal full permission to handle all aspects of the case within the portal. However, only the case owner can delete a case.