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// Register the window class.
  const char g_szClassName[] = "myWindowClass";

  WNDCLASS wc = { };

  wc.lpfnWndProc = WndProc;
  wc.hInstance = NULL;
  wc.lpszClassName = g_szClassName;

  RegisterClass(&wc);

  HWND hwnd = CreateWindowEx(
    0, // Optional window styles.
    "Sample Window Class", // Window class
    "Learn to Program Windows", // Window text
    WS_OVERLAPPEDWINDOW, // Window style

    // Size and position
    CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,

    (HWND)sc.ChartWindowHandle, // Parent window
    NULL, // Menu
    NULL, // Instance handle
    NULL // Additional application data
  );
  ShowWindow(hwnd, SW_SHOW);