DirectX® is the multimedia system foundation for the Microsoft® Windows® operating system. Through DirectX, programs take full advantage of your system to give you the best multimedia experience possible. DirectX 7.0a is an update to DirectX 7.0, providing the best compatibility with today's input devices and improved force feedback performance.
This latest version of DirectX also offers excellent graphics, faster frame rates, and more immersive audio when running and displaying programs rich in multimedia elements such as full-color graphics, video, 3-D animation, and surround sound.
For additional information about DirectX, please read the Microsoft DirectX, Technology Overview. (This site is in English.)