Behind-the-scenes technologies developed by Adobe Systems set the foundation for professional desktop publishing applications. Although Macintosh-based systems would continue to dominate the market, in 1986, the GEM-based Ventura Publisher was introduced for MS-DOS computers. While PageMaker's pasteboard metaphor closely simulated the process of creating layouts manually, Ventura Publisher automated the layout process through its use of style sheets. This software automatically generated indices and other body matter. This made it suitable for manuals and other long-format documents.