How to incorporate a windows application into a personal application area?

Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As IntPtr
Declare Auto Function SetParent Lib "user32.dll" (ByVal hWndChild As IntPtr, ByVal hWndNewParent As IntPtr) As Integer
Declare Auto Function SendMessage Lib "user32.dll" (ByVal hWnd As IntPtr, ByVal Msg As Integer, ByVal wParam As Integer, ByVal lParam As Integer) As Integer
Private Const WM_SYSCOMMAND As Integer = 274
Private Const SC_MAXIMIZE As Integer = 61488

Private hWnd As Long = 0

Private Sub SimpleButton1_Click(sender As Object, e As EventArgs) Handles SimpleButton1.Click
   'May i'm not needing to run a process for exemple
   'Dim proc As Process

   'proc = Process.Start(Environment.GetEnvironmentVariable("windir") + "\notepad.exe") 

If hWnd = 0 Then
   'in my program context, Tfrm_ifc_view, was my classname
   hWnd = FindWindow("Tfrm_ifc_view", Nothing)
   If hWnd <> 0 Then
      SetParent(hWnd, Me.Panel1.Handle)
      SendMessage(hWnd, WM_SYSCOMMAND, SC_MAXIMIZE, 0)
   End If
else
   SetParent(hWnd, nothing)
   hWnd = 0
end if
End Sub