In the Autodesk Viewing History posting, I chronicled the transition from Autodesk View, WHIP!, Volo View, Volo View Express, Express Viewer, and DWF Viewer.
Software Engineer, Larry Horner, is one of the programmers who has worked on DWF viewing technology for several years. He started on Volo View. When Autodesk offered the Autodesk Express Viewer, there was an "Easter egg" in the About box that navigated to a page:
Though the Express Viewer has evolved into the DWF Viewer, the page is still fun. So go ahead - click on the image above and ask Larry.