 the first OS vendor to include a commercial web server, NCSA HTTPd, and commercial web browser, NCSA Mosaic.Their X.desktop product line, obtained when they acquired IXI Limited in the UK, was the first to have icons for URLs (controlled via the Deskshell scripting language) and an HTML-based help system, called DeskHelp, which extended the NCSA Mosaic web browser to include APIs and scripting linked to the X.desktop product for interactive control.The IXI Limited scripting language based on Python was later replaced with JavaScript.