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The first public release of Keychain Manager was version 2.0, which is supported on computers running Mac OS 9 or later. Keychain Manager 1.0.1 SDK was the first version of Keychain Manager released to developers. For a summary of the changes to the Keychain Manager API from 1.0.1 to 2.0, see . The Keychain Manager is implemented as in a shared library called the Keychain Library. The user installs this library in the Extensions Folder in the System Folder of Mac OS. The data is stored in the Keychains folder, located inside the Preferences folder.
