Stocktrading

How did they determine which stock market orders were canceled from the debockle on 06 May 2010?

I just happened to be home for lunch last Thursday at 1415, watching CNBC. I sat in utter amazement (and a little fear) as the Dow Jones dropped from about -350 points to -960 points in about 90 seconds. I received a message this morning stating that the NYSE & NASDAQ were going to cancel certain orders that were executed between 1440 & 1500 on 06 May 2010. I heard something about how they determined what orders would be canceled, like if they were outside of a percentage from their normal trading range or 200 day moving average, or something. What was that ruling and how have they determined which stock trades would be affected?

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Dow Jones 2010 Technical Analysis Rumor Mill Weekly Sell Signal