1. A method of tracking information for a plurality of securities at a computing device of the type which is capable of exchanging information with a communications center, the method comprising: maintaining a data list at the computing device which includes each of the plurality of securities being tracked, wherein the data list is limited to a predetermined number of securities, and wherein the data list includes a user-defined category tag for each of the plurality of securities being tracked, wherein the data list includes a first number which indicates a running total of the number of items in the data list, and a second number which indicates a predetermined number of data items permitted in the data list; and generating at least one sublist with the computing device that includes a subset of the plurality of securities being tracked, wherein each sublist corresponds to a user-defined category tag, whereby each of the securities included in each sublist includes the user-defined category tag associated with the corresponding sublist.