Collaboration Framework Reference
The Collaboration framework is a set of Objective-C classes that allows developers to monitor identities and their attributes. Identities reside in an identity authority, which can be either local to a user’s system, or on a network directory. The Collaboration framework also manages a sheet, known as the identity picker, to allow applications to select identities.
The Collaboration framework works closely with the Core Services Identity APIs to form the Identity Services technology. If you need the ability to create and manipulate identities read Core Services Identity Reference.