The System Configuration Framework
The user is free to change aspects of their system configuration at any time, such as changing their network location from “Office” to “Home.” Changing the network location could change a number of lower-level settings, such as which IP addresses the machine has available and which DNS servers to use. There are also system parameters that change dynamically, such as the battery level in laptops. In some situations, your application needs to be able to react to these changes. For example, if you have a network socket listening on a particular IP address (as opposed to listening on all of them), you’ll need to listen on the new IP if the user changes it.
In Mac OS X 10.1, Apple introduced the system configuration ...
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