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Do you know whether AP1200 with 802.11g can support 802.11b and 802.11g client at the same time? Is it auto search for bandwidth requirement?
Yes, this can be done but If you select 12 Mbps or higher for the basic data rate on the 802.11g radio, 802.11b client devices cannot associate to the access point's 802.11g radio. For more etails check this configuration guide
yes they both can connect at the same time, but the "g" client will have to talk at 11mbs, since once a "b" client connects then every client would have to talk at 11mbs or lower.