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U.S. Patent May 4, 2004 Sheet 17 of 18 US 6,731,992 B1 PROCESS IIVIER DETERMINE TIRER TYPE POLLING IIMER RESEND IIVER DEVICE OPERATION VERIFY TIMER IIIIER I nun NEXT HND NExI DEVICE T0 DEVICE T0 ‘goals? 8E POLLED BE REIRIED OPERAHON QUEUE NEXT oEVIcE oPERAIIoN u IRESEND THE LAST - COMMAND TO THE nEVIcE T0 POLL THE DEVICE sEI IVAIIIIII; REIIIRR VERIFIcAIIoR Ems; HOLD THE DEVICE oPERAIIoNs ouEuE; START THE VERIFY TIMER REIURN FIG.11D