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An outgoing call cannot be made since the application is dispatching an input-synchronous call
IEnumerable swc = SHDocVw.ShellWindows()
    HashSet<WindowInfo> windows = new HashSet<WindowInfo>();
    foreach (SHDocVw.InternetExplorer ie in swc)
    {
        if (!ie.FullName.ToLower().Contains("iexplore.exe"))
            continue;

        IntPtr hwnd;
        IEPlugin.IOleWindow window = ie.Document as IEPlugin.IOleWindow;
        window.GetWindow(out hwnd);

        WindowInfo info = new WindowInfo();
        info.handle = hwnd;
        info.extraInfo = ie;
        windows.Add(info);
    }

interface IOleWindow : IUnknown
{
...
    [input_sync]
    HRESULT GetWindow
    (
        [out] HWND *phwnd
    );