there needed to be transaction resiliency with respect to single round trip with something like email that might not happen in strictly real-time (extremely long round-trip delays).
Real-world systems have been known to have glitches ... order/transaction generation that accidentally repeats (regardless of whether or not transport is catching replay attacks).
--
Anne & Lynn Wheeler http://www.garlic.com/~lynn/
Internet trivia 20th anv http://www.garlic.com/~lynn/rfcietff.htm
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