A method of purchasing products and services on-line using a client connectable to a plurality of servers via a computer network. The method begins by initiating from the client two or more independent transaction sessions, each of the independent transaction sessions established as a connection between the client and one of the plurality of servers is active. During each independent transaction session, transaction information is collected at the client to facilitate a purchase of products and services after the connection between the client and the server is closed and the transaction session is completed. According to the invention, the transaction information is maintained persistent across multiple independent transaction sessions. At a given time, for example, after all Web sites have been visited and the information gathered, the transaction information (as originally collected and/or as filtered, updated or enhanced) is then used to effect a purchase of given products and services.