public class ExternalApplication
{
#region "API usage declarations"

[DllImport("user32.dll")]
public static extern int FindWindow(string strclassName, string strWindowName);
[DllImport("user32.dll")]
public static extern int SetParent(int hWndChild, int hWndNewParent);
[DllImport("user32.dll")]
public static extern int GetParent(int hWndChild);
[DllImport("user32.dll", EntryPoint = "SetWindowPos")]
public static extern bool SetWindowPos(
  int hWnd,               // handle to window
  int hWndInsertAfter,    // placement-order handle
  int X,                  // horizontal position
  int Y,                  // vertical position
  int cx,                 // width
  int cy,                 // height
  uint uFlags             // window-positioning options
);
[DllImport("user32.dll", EntryPoint = "MoveWindow")]
public static extern bool MoveWindow(
  int hWnd, 
  int X,
  int Y,
  int nWidth,
  int nHeight,
  bool bRepaint
);
[DllImport("user32.dll", EntryPoint = "ShowWindow")]
public static extern Int32 ShowWindow(
  Int32 hWnd,
  Int32 nCmdShow
);
public const int MF_BYPOSITION = 0x400;
public const int MF_REMOVE = 0x1000;
public const Int32 SW_HIDE = 0;
public const Int32 SW_RESTORE = 9;
public const Int32 SWP_DRAWFRAME = 0x20;
public const Int32 SWP_NOMOVE = 0x2;
public const Int32 SWP_NOSIZE = 0x1;
public const Int32 SWP_NOZORDER = 0x4;
#endregion

public static int wordWnd = 0;

internal static Word.ApplicationClass _WordApplication = null;
public static Word.ApplicationClass WordApplication
{
  get
  {
    if (ExternalApplication._WordApplication == null)
    {
      ExternalApplication._WordApplication = new Word.ApplicationClass();
      if (wordWnd == 0) wordWnd = FindWindow("Opusapp", null);
      ExternalApplication.SetParent(ExternalApplication.wordWnd, Thread.CurrentThread.ManagedThreadId);
      _WordApplication.ApplicationEvents4_Event_Quit += new Microsoft.Office.Interop.Word.ApplicationEvents4_QuitEventHandler(ExternalApplication.OnQuit);
    }
    return ExternalApplication._WordApplication;
  }
}

  this.WordApplication.Visible = true;
  this.WordApplication.DocumentBeforeClose += new Word.ApplicationEvents4_DocumentBeforeCloseEventHandler(OnClose);
  this.WordApplication.ApplicationEvents2_Event_Quit += new Microsoft.Office.Interop.Word.ApplicationEvents2_QuitEventHandler(OnQuit);
  ExternalApplication.SetParent(ExternalApplication.wordWnd, this.Handle.ToInt32());
  ExternalApplication.SetWindowPos(ExternalApplication.wordWnd, this.Handle.ToInt32(), 0, 0, this.Bounds.Width, this.Bounds.Height, ExternalApplication.SWP_NOZORDER | ExternalApplication.SWP_NOMOVE | ExternalApplication.SWP_DRAWFRAME | ExternalApplication.SWP_NOSIZE);