(proactive)PossResend^PossDupFlag(reactive)

A common interview question. http://fixmeisters.blogspot.com/2006/04/possdupflag-or-possresend-this.html has details.

msg with PossDupFlag msg with PossResend
handled by FIX engine application to check many details. Engine can’t help.
seq # old seq # new seq #
triggered by retrans request not automatically
generated by FIX engine not automatically
reactive action by engine proactive decision by application
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