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 current highest bid price and a current lowest ask price (1020, 1101) available for the commodity; means for displaying a first quantity at a first area aligned with a first price level in a field of prices (1005, 1203), the first quantity being associated with the current highest bid price for the commodity; means for displaying a second quantity at a second area aligned with a second price level in the field of prices, the second quantity being associated with the current lowest ask price for the commodity; and means for updating the display of the first and second quantities, wherein in response to new data representing a different highest bid price and/ or lowest ask price of the commodity received from the electronic exchange via the interface, at least one of the first and second quantities is moved relative to the field of prices to a different area aligned with a different price level in the field of prices; 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 areas (1003, 1004: 1201, 1202), each area 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 area being selectable by a user input means, the device being configured such that selection of one of the plurality of areas sends an order message to the electronic exchange based on the trade order parameter and the price level that is aligned with the selected area. an interface for receiving data relating to the commodity from the electronic exchange, the data comprising at least a current highest bid price and a current lowest ask price (1020, 1101) available for the commodity; means for displaying a first quantity at a first area aligned with a first price level in a field of prices (1005, 1203), the first quantity being associated with the current highest bid price for the commodity; means for displaying a second quantity at a second area aligned with a second price level in the field of prices, the second quantity being associated with the current lowest ask price for the commodity; and means for updating the display of the first and second quantities, wherein in response to new data representing a different highest bid price and/ or lowest ask price of the commodity received from the electronic exchange via the interface, at least one of the first and second quantities is moved relative to the field of prices to a different area aligned with a different price level in the field of prices; 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 areas (1003, 1004: 1201, 1202), each area 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 area being selectable by a user input means, the device being configured such that selection of one of the plurality of areas sends an order message to the electronic exchange based on the trade order parameter and the price level that is aligned with the selected area.