Windows.h

<Windows.h> is a source code header file that Microsoft provides for the development of programs that access the Windows API (WinAPI) via C language. It declares the WinAPI functions, associated data types and common macros.

Access to WinAPI can be enabled for a C or C++ program by including it into a source file: 

// in C:
#include <Windows.h>

// in C++:
import <Windows.h>;

Also, the executable must be linked to each static library that either contains the function code or more commonly defines runtime, dynamic linking to a system dynamic link library (DLL). Generally, for functions in a DLL named like Abc.dll, the program must be linked to a library named like Abc.lib. For MinGW, the library name is like libAbc.dll.a.

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