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Note that the bulk of this material represents a "snapshot in time" based on the currently prevalent user interface metaphors and capabilities in wide use. Adjustments for mobile devices, lacking screen size or pointing devices, as well as for touch screen devices are inevitable. Some of the material reflects the limitations of such interfaces already.
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Elements of the Federated User Experience
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The case of outright technical failure is discussed in the Error Handling topic. The more complex Federated Error Handling topic discusses failure due to access control issues and the hand-off between IdPs and SPs.