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As for the second part of the question, the answer is in section 11.5.1 as quoted below.

A STA shall provide an AP with its minimum and maximum transmit power capability for the current channel when associating or reassociating, using a Power Capability element in Association Request frames or Reassociation Request frames. An AP may use the minimum and maximum transmit power capability of associated STAs as an input into the algorithm used to determine the local transmit power constraint for any BSS it maintains. The specification of the algorithm is beyond the scope of this amendment. An AP may reject an association or reassociation request from a STA if it considers the STA?¡é?€??s minimum or
maximum transmit power capability is unacceptable. For example, a STA?¡é?€??s power capability might be unacceptable if it violates local regulatory constraints or increases the probability of hidden stations by a significant degree. The criteria for accepting or rejecting an association or reassociation on the basis of transmit power capability are beyond the scope of this amendment.


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