As market conditions descend or ascend an axis of prices, the display of market information is repositioned, at a pre-determined rate if desired, around an item of interest. An item of interest may include the best bid price, the best ask price, the inside market, a moving average, a last traded price,...http://www.google.com/patents/US7930240?utm_source=gb-gplus-sharePatent US7930240 - Repositioning of market information on trading screens
Repositioning of market information on trading screens