Apple Remote Access MultiPort Server - Manual (Page 81)

Note: If you add users who have This Macintosh Only selected in their User
information windows to the list, their zone access automatically changes to Only
Zones Listed.
5 Click the Add button.
The window disappears, returning you to the Zone window. The users you
selected now appear in the User List for the zone.
The Save and Revert buttons become active in the Zone window.
6 Click Save to save the User List for the zone.
Note: When the Zone window is displayed, you can add users to it directly
from the main User List. Choose User List from the Users menu to display the
list. Select the users and drag them from the User List into the Zone window.
Working with the Zone List 81