Some APs do support multiple SSIDs by using a single radio tuned to one channel. However, if a device only has one radio, it cannot operate in both infrastructure mode and ad hoc mode at the same time. Therefore, your laptop can either connect to SSID#1 in infrastructure mode to reach the Internet through your wireless router, OR it can connect to SSID#2 in ad hoc mode to directly reach another station, but it cannot do both simultaneously unless it has two wireless PC cards.
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