# SCSchemaDefinitions ## Overview This document describes keys and values used to access elements in the System Configuration persistent store. ## Topics ### Constants [Generic Keys](/documentation/SystemConfiguration/generic-keys) General-purpose keys that apply to multiple dictionaries in the persistent store. [Preference Keys](/documentation/SystemConfiguration/preference-keys) Keys that correspond to preferences in the persistent store. [Component Keys](/documentation/SystemConfiguration/component-keys) Keys that correspond to components in the persistent store. [Network Dictionary Keys](/documentation/SystemConfiguration/network-dictionary-keys) Keys that correspond to values in the `kSCCompNetwork` dictionary. [Interface Dictionary Keys](/documentation/SystemConfiguration/interface-dictionary-keys) Keys that correspond to values in the `kSCCompInterface` dictionary. [Hostnames Dictionary Keys](/documentation/SystemConfiguration/hostnames-dictionary-keys) Keys that correspond to values in the `kSCCompHostnames` dictionary. [Network Entity Keys](/documentation/SystemConfiguration/network-entity-keys) Keys that correspond to network entity dictionaries in the persistent store. [DNS Entity Keys](/documentation/SystemConfiguration/dns-entity-keys) Keys that correspond to values in the `kSCEntNetDNS` dictionary. [Ethernet Entity Keys](/documentation/SystemConfiguration/ethernet-entity-keys) Keys that correspond to values in the `kSCEntNetEthernet` dictionary. [Interface Entity Keys](/documentation/SystemConfiguration/interface-entity-keys) Keys that correspond to values in the `kSCEntNetInterface` dictionary. [IPSec Entity Keys](/documentation/SystemConfiguration/ipsec-entity-keys) Keys that correspond to values in the `kSCEntNetIPSec` dictionary. [IPv4 Entity Keys](/documentation/SystemConfiguration/ipv4-entity-keys) Keys that correspond to values in the `kSCEntNetIPv4` dictionary. [IPv6 Entity Keys](/documentation/SystemConfiguration/ipv6-entity-keys) Keys that correspond to values in the `kSCEntNetIPv6` dictionary. [6to4 Entity Keys](/documentation/SystemConfiguration/6to4-entity-keys) Keys that correspond to values in the `kSCEntNet6to4` dictionary. [Link Entity Keys](/documentation/SystemConfiguration/link-entity-keys) Keys that correspond to values in the `kSCEntNetLink` dictionary. [Modem Entity Keys](/documentation/SystemConfiguration/modem-entity-keys) Keys that correspond to values in the `kSCEntNetModem` dictionary. [PPP Entity Keys](/documentation/SystemConfiguration/ppp-entity-keys) Keys that correspond to values in the `kSCEntNetPPP` dictionary. [L2TP Entity Keys](/documentation/SystemConfiguration/l2tp-entity-keys) Keys that correspond to values in the `kSCEntNetL2TP` dictionary. [Proxies Entity Keys](/documentation/SystemConfiguration/proxies-entity-keys) Keys that correspond to values in the `kSCEntNetProxies` dictionary. [SMB Entity Keys](/documentation/SystemConfiguration/smb-entity-keys) Keys that correspond to values in the `kSCEntNetSMB` dictionary. [CompUsers Entity Keys](/documentation/SystemConfiguration/compusers-entity-keys) Keys that correspond to values in the [`kSCCompUsers`](/documentation/SystemConfiguration/kSCCompUsers-swift.var) dictionary. [CompSystem Entity Keys](/documentation/SystemConfiguration/compsystem-entity-keys) Keys that correspond to values in the `kSCCompSystem` dictionary. [Dynamic Store Domain Prefixes](/documentation/SystemConfiguration/dynamic-store-domain-prefixes) Prefixes used to access information in the dynamic store. [Dynamic Store Entity Keys](/documentation/SystemConfiguration/dynamic-store-entity-keys) Keys that correspond to values in the dynamic store. [Reserved Keys](/documentation/SystemConfiguration/reserved-keys) Keys that have a reserved usage. ### Deprecated Constants [AirPort Dictionary Keys](/documentation/SystemConfiguration/airport-dictionary-keys) Keys that correspond to values in the `kSCEntNetAirPort` dictionary. [Deprecated Keys](/documentation/SystemConfiguration/deprecated-keys) Keys that are no longer supported. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)