Electronic file retrieval method and system

A method of operating a computer system (1) having a display (6) and being connected to the WWW (4). A Web page is downloaded into a buffer memory (8) of the computer system (1) from the WWW (4), the page being an HTML file. Keywords are identified in the downloaded page and the HTML file held in the buffer memory (8) is then modified on-the-fly to introduce links to a database searching application, each link corresponding to an identified keyword. The downloaded Web page is displayed on the computer system display (6), with the introduced links appearing as user selectable items. By selecting a link, the searching application is launched and previously downloaded Web pages which contain the associated keyword are identified.