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conceptual issue with claim to privileges mapping

Posted By:      Posted Date: October 13, 2010    Points: 0   Category :SharePoint

When using claims base authorization how are the claims converted to specific privileges? 

To be a bit more clear, the provider is given and Uri and identity and augments the claims listing, when SharePoint receives the augmented list how do I make SharePoint's authentication mechanism to add user to a group or provide a specific privilege

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