Hi: I also got the confusion with this question, when I want collect each AP's RSSI real-time. quote: The miniport driver must manage its cached BSSID scan list in the following ways: The driver must clear its BSSID scan list when set by OID_802_11_BSSID_LIST_SCAN before it starts the explicit network scan. Because we use the OID in the upper layer of the system. The Application just pass down the OID to the under miniport driver. It seems that the driver will do the clear things for us. The actual implement of the hardware is variety, so it is unforeseen.