= Application-layer acknowledgement
= Application-layer acknowledgment
{synonym}
An <application-layer acknowledgement> confirms a condition specified by an application's <communication protocol>. Receipt, successful processing and durable storage are different conditions. A <Transmission Control Protocol> acknowledgement of received bytes does not itself establish any stronger application promise; the relevant <endpoint> must establish that promise.<End-to-end arguments in system design by Jerome H. Saltzer and others>[Printed p. 7: the SWALLOW example distinguishes message delivery from safe storage]{ref}
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