Via FT:

The New York Stock Exchange is responding to the sharp rise in algorithmic trading by introducing technology designed to give NYSE floor brokers the ability to trade algorithmically and more easily locate large sources of liquidity.

Algorithmic trading uses mathematical models as a means of trading large blocks of shares quickly. Tabb Group, the US consultancy, predicts that by 2010 algorithmic trading will account for half of all US equity trading. Floor brokers will also be able to search for deep liquidity by broadcasting and subscribing to specific stocks in which they have a large interest.