From Shyam Pillai:
LiveWeb can add web pages into a PowerPoint slide and refresh the pages real-time during slide show. It displays web pages without ever leaving the confines of your PowerPoint slide show. LiveWeb works with documents off your local drive too. You can specify relative paths. LiveWeb will also look for files in the presentation folder if the files have local drive information and cannot be located at the location specified by the user during slideshow. LiveWeb encapsulates the need to insert a web browser control manually and write code to update the web pages within the control during the slide show.