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XQPCTLD1 is a system parameter that controls multithreading, which can be used only by PATHWORKS servers. The default value of XQPCTLD1 is 8, which enables multithreading. Setting XQPCTLD1 to 0 disables multithreading, This special parameter is use by VSI and is subject to change. Do not change this parameter unless VSI recommends that you do so.