callback

1. The act or an instance of calling back from one location or situation to the previous one: a callback of laid-off auto workers.
2. A return telephone or radio call.
3. A recall of a recently sold product by the manufacturer to correct a defect.

An authentication technique that calls the sender back. After connection is made, the receiving side breaks the connection and calls the sender to ensure that the logon was made from the authorized computer. Callback prevents a stolen ID and password from being used on a different machine. See also Web callback.

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