requests to the trading platform 106 in one embodiment the client is provided an indication of the quantity of the security such as number of shares that were purchased through the open order prior to the cancel replace request fig2 is an illustration of a user interface retrieved based upon an open order in accordance with an illustrative implementation a client 102 can display a user interface 202 upon selection by a user of an open order in the trading interface not shown in an implementation the user interface 202 can include information related to the open order for example the user interface 202 can include an open order identifier 204 uniquely associated with the open order and the security identifier 206 for the security associated with the open order the security associated with the open order can be any security including but not limited to a stock or an option the user interface can also present additional data such as price data for the security identified by the security identifier 206 for example the user interface 202 can include buttons or links for the current bid price 208 the current ask price 210 the last price 212 and the mark price.