Adobe InDesign is a desktop publishing software application produced by Adobe Systems. It can be used to create works such as posters, flyers, brochures, magazines, newspapers, and books. InDesign can also publish content suitable for tablet devices in conjunction with Adobe Digital Publishing Suite. Graphic designers and production artists are the principal users, creating and laying out periodical publications, posters, and print media. It also supports export to EPUB and SWF formats to create e-books and digital publications, including digital magazines, and content suitable for consumption on tablet computers. In addition, InDesign supports XML, style sheets, and other coding markup, making it suitable for exporting tagged text content for use in other digital and online formats. The Adobe InCopy word processor uses the same formatting engine as InDesign. InDesign is the successor to Adobe PageMaker, which was acquired with the purchase of Aldus in late 1994. By 1998 PageMaker had lost almost the entire professional market to the comparatively feature-rich QuarkXPress 3.3, released in 1992, and 4.0, released in 1996. Quark stated its intention to buy out Adobe and to divest the combined company of PageMaker to avoid anti-trust issues. Adobe rebuffed the offer and instead continued to work on a new page layout application. The project had been started by Aldus and was code-named "Shuksan". It was later code-named "K2" and was released as InDesign 1.0 in 2000.