In a computer system, a token added to a message can be reused in messages that are part of the same transaction. If the application that originally sent a request that included the token receives a request that includes the token, the application will not perform an additional action based on receiving the request. The stopping of further actions can occur based on receiving the same token once or a threshold number of times.
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Harm, Michael and Howard, Seth, "Adding Token to Prevent Cycles", Technical Disclosure Commons, (April 18, 2017)