Drill-down is the act of displaying more specific information about a series data points. If a pie series slice is clicked, a URL is loaded into the browser window, bringing additional information. PieApplet supports drill-down by means of the 'urls' parameter, to which a list of URLs has to be given.

The applet below displays statistical information about most popular search engines audience, as a result of a research conducted on a sample of web surfers in the USA and compiled on March 2002. A mouse click on a slice brings the website of the respective search engine. For this demo to work there must be an active Internet connection.