She said JPMorgan Chase is also making a concerted effort to market the traditionally testosterone-heavy trading floor as an appealing place for women.

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As the downdraft worsened, he says an executive for the firm ran on to the trading floor and gave the order to pull out of the market.

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With many roads flooded and mass transit still in disarray, NYSE officials helped trading-floor workers arrange rides and carpools to reach the exchange for the market opening.

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In its latest release, NYSE Euronext says its NYSE Arca exchange should be considered the primary market under its proposed scenario to open for trading without the floor.

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"Computer systems don't have a sense of morality, " exclaims MacKenzie, noting the take-one-for-the-team role played by floor specialists in keeping an orderly market--a role that's been marginalized with trading so widely dispersed.

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Honestly, it is unusual for the market to test a floor four separate times without breaking it, but we have avoided trading with that sort of bias.

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