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# System Configuration

Allow applications to access a device’s network configuration settings. Determine the reachability of the device, such as whether Wi-Fi or cell connectivity are active.

## Overview

This collection of documents describes the programming interfaces of the System Configuration framework. The System Configuration framework provides functions that determine the reachability of target hosts in both a synchronous and an asynchronous manner. It also provides error detection facilities.

## Topics

### Reference

[DHCPClientPreferences](/documentation/SystemConfiguration/dhcpclientpreferences)

[SCDynamicStore](/documentation/SystemConfiguration/scdynamicstore-gb2)

[SCDynamicStoreCopyDHCPInfo](/documentation/SystemConfiguration/scdynamicstorecopydhcpinfo-apicollection)

[SCDynamicStoreCopySpecific](/documentation/SystemConfiguration/scdynamicstorecopyspecific)

[SCDynamicStoreKey](/documentation/SystemConfiguration/scdynamicstorekey)

[SCNetwork](/documentation/SystemConfiguration/scnetwork)

[SCNetworkConfiguration](/documentation/SystemConfiguration/scnetworkconfiguration)

[SCNetworkConnection](/documentation/SystemConfiguration/scnetworkconnection-g7e)

[SCNetworkReachability](/documentation/SystemConfiguration/scnetworkreachability-g7d)

[SCPreferences](/documentation/SystemConfiguration/scpreferences-ft8)

[SCPreferencesPath](/documentation/SystemConfiguration/scpreferencespath)

[SCPreferencesSetSpecific](/documentation/SystemConfiguration/scpreferencessetspecific)

[SCSchemaDefinitions](/documentation/SystemConfiguration/scschemadefinitions)

[System Configuration](/documentation/SystemConfiguration/system-configuration)

[SystemConfiguration Enumerations](/documentation/SystemConfiguration/systemconfiguration-enumerations)

[SystemConfiguration Constants](/documentation/SystemConfiguration/systemconfiguration-constants)

[SystemConfiguration Functions](/documentation/SystemConfiguration/systemconfiguration-functions)

[SystemConfiguration Data Types](/documentation/SystemConfiguration/systemconfiguration-data-types)

### Entitlements

  <doc://com.apple.documentation/documentation/BundleResources/Entitlements/com.apple.developer.networking.wifi-info>

### Macros

[Macros](/documentation/SystemConfiguration/SystemConfiguration-macros)

## See Also

  [System Configuration Programming Guidelines](https://developer.apple.com/library/archive/documentation/Networking/Conceptual/SystemConfigFrameworks/SC_Intro/SC_Intro.html#//apple_ref/doc/uid/TP40001065)


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