Patent ID: 7805355

Claim:
A method for placing an order for a financial instrument on an electronic exchange using a computer-implemented graphical user interface that includes a display screen and a user input device that allows the user to interact with the display screen, comprising: dynamically displaying by a computer a market depth of the financial instrument including: a dynamic display of bids in the market for the financial instrument, a dynamic display of asks in the market for the financial instrument, and a dynamic display of prices in the market for the financial instrument, wherein the dynamic price display is interposed between or adjacent to one of the dynamic bid display and the dynamic ask display; moving information by the computer within each of the dynamic displays with changes in the market for the financial instrument; selecting by the user input device to select a region of one of the dynamic displays, the selected region including a bid volume or an ask volume and a corresponding price, the computer temporarily freezing movement of the selected region of the dynamic displays as long as the selected region remains selected, even though a market change causes the computer to move unselected portions of the dynamic displays; and entering by the user device to enter an order for the financial instrument at a price displayed in or associated with the selected region, the computer providing the entered order for transmission to the electronic exchange.