> What are all those extra words, such as `WINAPI`, or `CALLBACK`, or `HINSTANCE`, or `_In_`? The traditional Windows API uses typedefs and preprocessor macros extensively to abstract away some of the details of types and platform-specific code, such as calling conventions, **`__declspec`** declarations, and compiler pragmas. In Visual Studio, you can use the IntelliSense [Quick Info](/visualstudio/ide/using-intellisense#quick-info) feature to see what these typedefs and macros define. Hover your mouse over the word of interest, or select it and press **Ctrl**+**K**, **Ctrl**+**I** for a small pop-up window that contains the definition. For more information, see [Using IntelliSense](/visualstudio/ide/using-intellisense). Parameters and return types often use *SAL Annotations* to help you catch programming errors. For more information, see [Using SAL Annotations to Reduce C/C++ Code Defects](../code-quality/using-sal-annotations-to-reduce-c-cpp-code-defects.md).
0 commit comments