This is the sequence number of the most recent trap actually sent to the management station, meant to be compared against sTrapNextSeqNum to check for a trap backlog. An administrator uses the gap between these two values to determine if traps are queuing up faster than the subagent's throttling rate (sCfgMaxTrapSec) allows them to be sent. For example, a large and growing gap between sTrapLastSeqNumSent and sTrapNextSeqNum would prompt the administrator to raise the maximum traps-per-second setting.