In an exemplary embodiment a request/reply network messaging scheme is utilized wherein {HEAD ~ either} of {TAIL ~ the two access points} initially transmits a test request, and in response the receiving access point issues a test reply 
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In an exemplary embodiment a request / reply network messaging scheme is utilized wherein { HEAD ~ either } of { TAIL ~ the two access points } initially transmits a test request , and in response the receiving access point issues a test reply
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