The present invention is directed toward providing a system for monitoring events occurring on a networked browser while the browser is processing web page-based transactions and information, wherein the data from the monitoring process is sent to a computer other than the browser on which the transactions are executing and other than the computer from which the transaction was downloaded. Exemplary embodiments of the invention are directed toward a system and method for invoking a monitoring function on a network computer, including the steps of accessing a web page from a web server, updating the web page by inserting a script tag in the web page, wherein the script tag includes location information for a function for monitoring events on a network computer other than the web server, and storing the updated web page on the web server. An alternate embodiment is directed toward a system and method for monitoring events on a network computer, including the steps of downloading a web page from a web server to a client browser within a network, wherein the web page includes a script tag identifying a location of a monitoring function; retrieving the monitoring function based on information in the script tag; invoking the monitoring function to monitor an event on the client browser; and sending monitored data to a measurement computer, wherein the measurement computer is a computer other than the web server.