This feature was available in our 11.5 driver but has since been removed for security reasons.
You may want to visit the wireless support Community for additional assistance. http://communities.intel.com/community/tech/wireless
Intel Customer Support
Thanks for confirming my suspicion that my driver update was keeping me from using my MAC spoofing program. I may purchase a USB NIC for MAC spoofing but in case I want to stick with my Intel Pro/Wireless 3945 ABG, can you suggest where I might download my old driver. My "system restore" failed to make a copy of my old driver so I cannot simply roll it back.