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Can a 340 or 350 workgroup bridge talk with another 340 or 350 workgroup bridge? If not, will a 340 series "multifunction bridge" communicate with either workgroup bridge, or do you need an AP to communicate with them?
The WorkGroup Bridge is a CLIENT device, which means it must communicate with some root device. That root device can be either an access point or a [multifunction] bridge in access point mode.
It is a very common misconception that the WorkGroup Bridge is a cheap substitute for a BR3xx bridge. WGB products to NOT talk to each other.