A device (110 - 116) for receiving a command relating to a commodity being traded in a market on an electronic exchange (101 - 103), the device comprising: an interface for receiving data relating to the commodity from the electronic exchange, the data comprising at least a last trade price available for the commodity; means for displaying a quantity associated with the last trade price at a location aligned with the last trade price along a field of prices; means for updating the display of the quantity associated with the last trade price, wherein in response to new data representing a different last trade price of the commodity received from the electronic exchange via the interface, the quantity associated with the last trade price is moved relative to the field of prices to a different location aligned with a different price level in the field of prices and reflects the new data; means for displaying status information at a location aligned with a particular price level along the field of prices, the displayed status information being associated with an order entered at the electronic exchange at the particular price level; means for receiving a command that selects the location associated with the displayed status information so as to cancel the order at the electronic exchange; means for setting a trade order parameter comprising an order quantity; and means for displaying a plurality of locations (1003, 1004: 1201, 1202), each location being associated with a bid side of the market or an ask side of the market and being aligned with a price level in the field of prices, and each location being selectable by a user input means, the device being configured such that selection of one of the plurality of locations sends an order message to the electronic exchange based on the trade order parameter and the price level that is aligned with the selected location. an interface for receiving data relating to the commodity from the electronic exchange, the data comprising at least a last trade price available for the commodity; means for displaying a quantity associated with the last trade price at a location aligned with the last trade price along a field of prices; means for updating the display of the quantity associated with the last trade price, wherein in response to new data representing a different last trade price of the commodity received from the electronic exchange via the interface, the quantity associated with the last trade price is moved relative to the field of prices to a different location aligned with a different price level in the field of prices and reflects the new data; means for displaying status information at a location aligned with a particular price level along the field of prices, the displayed status information being associated with an order entered at the electronic exchange at the particular price level; means for receiving a command that selects the location associated with the displayed status information so as to cancel the order at the electronic exchange; means for setting a trade order parameter comprising an order quantity; and means for displaying a plurality of locations (1003, 1004: 1201, 1202), each location being associated with a bid side of the market or an ask side of the market and being aligned with a price level in the field of prices, and each location being selectable by a user input means, the device being configured such that selection of one of the plurality of locations sends an order message to the electronic exchange based on the trade order parameter and the price level that is aligned with the selected location.