Users are added through a pop-up window that has the following format:
Once a user has been added, the list is re-populated. When the add operation is canceled, the list is unchanged.
Users are edited through a pop-up window that has the following format:
Once the user has been updated, the list is re-populated to show the changes, which may include a change to the ordering of the items. When the edit operation is canceled, the list is unchanged.
Users are paged according to the user name, which is a valid email address.