Azure Access Control
The Access Control module of the Windows Azure AppFabric is a claims-based access control in the cloud that provides single-sign on capability to all applications running in the cloud. In addition, this access control module can be used for applications running outside of the cloud. This Access Control module of Windows Azure is accessed using a collection of REST Web Services. The current architecture behind the Access Control service is an Active Directory implementation. However, the use of RESTful components abstracts this implementation from the developer permitting future implementation changes.