You will find the menu "Advanced> Virtual wireless"
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I loaded the 85V firmware on a WNR3500L (v1) and hadn't noticed that it didn't have multiple SSID capability. The changelog says multiSSID was added at 90V but it isn't clear if that is true for the K26 firmware for the WNR3500L v1? Anyone know if it now supports MultiSSID on the v1?