Differences Between the Game SDK and the DirectX 2 SDK
The DirectX 2 SDK provides more services—and more avenues for innovation—than did the Game SDK. Although the DirectX 2 SDK contains additional functions and services, all of the applications you have written with the Game SDK will compile and run successfully without changes.
This section identifies some of the most significant differences and improvements of the DirectX 2 SDK over the Game SDK. The purpose of this section is to help developers familiar with the Game SDK quickly identify several important areas of the DirectX SDK that are significantly different.