Integrated Windows Authentication (IWA) uses the security features of Windows clients and servers. IWA enforces Single Sign-On by allowing Windows to gather user credentials during the initial interactive desktop login process and then transmitting that information to the security layer.
SiteMinder, using the Windows Authentication scheme, secures resources by processing user credentials that are obtained by the Microsoft Integrated Windows Authentication infrastructure.
The following diagram describes how you can configure SPS to support IWA:

You can configure one of the following authentication schemes with SPS:
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