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Ah, I understand. Yes the APs "know" about eachother across these subnet boundaries as long as the APs can "see" eachother via the air. Now whether or not they act on this is based on configuration - if they have the same HiveID and password they will work together to enable the capabilities you mention.
To make Roaming work you need to enable L3 Roaming (part of the User Profile) we will then act on this information to preserve IP address as the user roams across subnets.