DirectX 7.0a is an update to DirectX 7.0, providing improved force feedback performance and 
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the best compatibility with today's input devices. This latest version of DirectX also offers 
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excellent graphics, faster frame rates, and more immersive audio when running and displaying 
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programs rich in multimedia elements such as full-color graphics, video, 3-D animation, and 
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surround sound. If you had an earlier version of DirectX installed on your system, you will see 
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little difference in available space on your hard drive, since DirectX 7.0a will overwrite the 
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earlier version.