The TCP/IP control panel
The TCP/IP control panel gets installed as part of Open Transport,
along with the AppleTalk control panel. Its purpose is to direct
which port or link the Mac will use to "talk" TCP/IP, just as
the AppleTalk control panel controls which link is used to talk
AppleTalk.
User Mode
The first time you open the TCP/IP control panel, you'll probably
see a window with the fields you see here:
Above is "basic" mode, which contains a minimum of information
so as not to confuse a novice user. There are 3 user modes: Basic,
Advanced, and Administrator; modes are changed by selecting "User
Mode" under the "Edit" menu, or using the 'Command-U' keyboard
shortcut, which brings you to this window:
Below is the Administration mode, which is identical to Advanced
mode, except for the options to lock and password protect the
settings. Administrators may want to do this to keep the novice
user from inadvertently changing the settings. The configuration
information, as well as the mode type and password, if any, are
stored in "Macintosh HD:System Folder:Preferences:TCP/IP preferences",
where "Macintosh HD" is actually the name of the startup volume.
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