Geneva Server's Identifier

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If you open the Geneva Server MMC, right-click the root node in the treeview, and select Service Properties, you'll be presented with this dialog:


What is meant by that Identifier field?  What does it do and what is it for?  I wondered that too, and Hervey Wilson of the Geneva team told me that it has these two purposes:
  • When Geneva Server is in the identity provider role, this identifier is the Issuer URI of the STS which get included in tokens issued by it.
  • When Geneva Server is in the federation provider role, this ID is the audience URI that the STS will accept tokens with.