Editor's note: Richard Quest will answer any reasonable royal or G20 questions on Twitter @richardquest.
CNN International Correspondent
Did he or did she? Bow to the Queen that is!
Americans are often in a dither about whether or not they should give the traditional stiff bow from the neck, or a curtsy for women. It goes against the republican grain to make such a sign of respect to a monarch!
Of course there is absolutely no obligation for ANYONE - not even Brits these days - to bow to the Queen. It is not requested nor required. That was changed years ago.
When I met the Queen some years back, no one said a word about having to do it. But I did since I am a British national.
When President and Mrs. Obama met the Queen tonight, there was a handshake, and both the President and the Queen both nodded respectfully to each other.
Was it a bow? Not quite. It was more of a, "I know you are a head of state and so am I. We are both heads of state together and this is what heads of state do when they meet other heads of state." In other words they bow to each other without actually bowing.
However, Tim Geithner, the US Treasury Secretary was much more upfront about showing his respect to Her Majesty. A handshake and a firm nod of the head. No doubt about it. A sign of respect to one of the world's most respected heads of state.
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