| http://www.w3.org/ns/prov#value | - If the network communication is in another form, such as an email message, the control device can detect, from the IP packets, the protocol (e.g., POP, SMTP or other protocol known in the art) used by the network application (e.g., a mail user agent) and send a message back to the network application with, for example, an embedded link to the authentication interface.
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