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  "title" : "Instant Messaging Keys"
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# Instant Messaging Keys

The keys used to specify the different fields in a [`kABInstantMessageProperty`](/documentation/AddressBook/kABInstantMessageProperty) property.

## Discussion

Neither developers nor users can add more keys.

## Topics

### Constants

[`let kABInstantMessageUsernameKey: String`](/documentation/AddressBook/kABInstantMessageUsernameKey)

The instant messaging username or handle.

[`let kABInstantMessageServiceKey: String`](/documentation/AddressBook/kABInstantMessageServiceKey)

The instant messaging service.


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