Culbertson 4-5 NT
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The 4NT bid shows either:
1) 3 aces, or
2) 2 aces and a king of a geniune suit bid by the partnership


The responses to 4NT are:
1) 5NT with either 
   * 2 aces
   * 1 ace and all the kings of the genuine suits bid by the partnership

2) 5 of the lowest geniune suit bid by the partnership with
   * no ace

3) 5 of a suit or a jump to the lowest geniune suit bid with
   * 1 ace 


Responder may use his/her judgement when the response may have taken them
over the agreed trump suit-- responder may invent a lower suit bid.

If responder holds 2 aces and a king, responder should be interested in a 
grand slam. Responder may bid the suit with the king and then make a 
constructive bid later.