a variety of user interfaces , systems and methods are provided for traders of commodities , futures contracts , derivatives , stocks , etc . a user interface may have two display modes , locked and unlocked . in the locked mode , some or all of the data fields are locked . in the unlocked mode , all the data fields , including the price column , are dynamically updated . in a second embodiment , a price column is divided such that prices above the market are in a first column and prices below the market are in a second column to reduce the number of columns required to show bids , offers and prices . optionally , the trader &# 39 ; s bids and offers not exposed to the market can be shown in columns adjacent to the market bids and offers . in a third embodiment of the invention orders are cancelled if the market changes within a short period of time before the order is placed and the change does not benefit the user .