' Deklarationen
Public Declare Function SetWindowText Lib "user32" _
  Alias "SetWindowTextA" ( _
  ByVal hwnd As Long, _
  ByVal lpString As String) As Long
 
Public Declare Function UpdateWindow Lib "user32" _
  Alias "UpdateWindow" ( _
  ByVal hwnd As Long) As Long

SetWindowText WindowHandle, "neuer Text"
UpdateWindow WindowHandle

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