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Choices, Choices, Choices
Its possible to inject an identity object at almost any level of the protocol stack model
Application Identities shared across transport sessions
Transport Identities to allow agility of stack location
Host identities to allow agility of location of all hosted sessions

In this context an “identity” is a token to allow multiple locators to be recognised as belonging to a single communication state at both (or multiple) ends of the communication
PPT Version