DirectX, описание на английском:
DirectX 9.0c Redistributable - DirectX for Managed Code Update from the DirectX SDK Update (February 2007)
Microsoft DirectX is a group of technologies designed to make Windows-based computers an ideal platform for running and displaying applications rich in multimedia elements such as full-color graphics, video, 3D animation, and rich audio. DirectX includes security and performance updates, along with many new features across all technologies, which can be accessed by applications using the DirectX APIs.
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