Can Explain What This Is?

I Know It Opens A GUI Window Saying Goodbye, Cruel World. But Can Somone Explain What Each Part Means And Does For E.g. WINAPI and WinMain(HINSTANCE,


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  #include <windows.h>

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, 
    LPSTR lpCmdLine, int nCmdShow)
{
    MessageBox(NULL, "Goodbye, cruel world!", "Note", MB_OK);
    return 0;
}

Thanks
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