| ActiveUserSessions | Handler class maintaining active user sessions. | 
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| AuthenticatedUser | Instance holding data for the "authenticated" user. | 
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| UserAuthentication | Helper class to perform user authentication. | 
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| UserAuthenticationInfo | User authentication information with the authentication result. | 
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| UserProfileImageRequest | The request class for a User Profile Image. | 
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| UserProfileImageURNProvider | The URN User Profile Image Provider singleton class. | 
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| UserProfileStringURNProvider | The URN User Profile String Provider singleton class. | 
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| UserSessions | The UserSessions contains information about all sessions being run by the same user. | 
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