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# Reserved Keys

Keys that have a reserved usage.

## Topics

### Constants

[`let kSCResvLink: CFString`](/documentation/SystemConfiguration/kSCResvLink-swift.var)

The reserved key __LINK__.

[`let kSCResvInactive: CFString`](/documentation/SystemConfiguration/kSCResvInactive-swift.var)

The reserved key __INACTIVE__.


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