Ravisent is chiefly known for its CineMaster software, which allows DVD movies to be shown on PCs with DVD drives. The company has sold more than 18 million units of the PC software, senior vice president Alan McCann said. When the Xbox enters the market next October, its main competition is likely to be Sony's recently released PlayStation 2 console. The PlayStation 2 allows people to play DVD movies and game discs. Its DVD feature has received poor marks, however, because of its awkward controls.The PlayStation 2's DVD functions can only be accessed using the game controller and a complex on-screen menu or through bulky add-on remote controls sold by third-party manufacturers.