User32.dll Documentation -

Microsoft does not provide a single, unified document for the DLL itself. Instead, documentation is organized by the functions it exports within the Super User Primary Source

. It enables applications to implement a graphical user interface (GUI) that integrates seamlessly with the Windows environment Stack Overflow Core Functionality user32.dll documentation

HWND CreateWindowExA( DWORD dwExStyle, LPCSTR lpClassName, LPCSTR lpWindowName, DWORD dwStyle, int X, int Y, int nWidth, int nHeight, HWND hWndParent, HMENU hMenu, HINSTANCE hInstance, LPVOID lpParam ); Microsoft does not provide a single, unified document