Apple Workgroup Server 8550 - Manual (Page 37)

In Administration mode, you can do everything that can be done in
Advanced mode, plus lock (by clicking the lock icon) every setting except
the current Hosts file.
Setting a password
You can set a password that limits access to Administration mode for both
the AppleTalk control panel and the TCP/IP control panel.
To set a password:
1 With the AppleTalk or TCP/IP control panel open, choose User Mode
from the Edit menu.
2 In the box that appears, click the Administration button and then click
the Set Password button.
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