I set the lonely burden of this blog down for a while, sorry; I'd rather have it be more of a dialogue, with comments and contributions from you all, rather than me ranting about whatever crosses my mind. Perhaps that makes me a lousy blogger.
But anyway, the Gerber convention keeps coming up, so here it is. Blackwood, as you recall, is used after the partnership has found a trump fit. If the fit you've found is no-trump, Blackwood's 4NT will confuse the matter, so Gerber is used instead. It's quite similar: the asker bids 4C to ask for aces. Responses are:
4D: zero or four aces
4H: one ace
4S: two aces
4NT: three aces
If that satisfies the asker that the partnership has all the aces it will need for slam, 5C asks for kings. I don't believe there's any Roman Keycard Gerber in no-trump auctions. Gerber is on the cheat sheet.