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  { TForm1 }

  TForm1 = class(TForm)
    Image1: TImage;
    Label1: TLabel;
    procedure FormCreate(Sender: TObject);
  private
    procedure WMCopyData(var Msg: TWMCopyData); message WM_COPYDATA;  // genau hier !
  public
    { public declarations }
  end;                    

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  TWMCopyData = packed record
    Msg: Cardinal;
    From: HWND;
    CopyDataStruct: PCopyDataStruct;
    Result: Longint;
  end;

  WM_COPYDATA         = $004A;                    

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type
  { lParam of WM_COPYDATA message points to... }
  PCopyDataStruct = ^TCopyDataStruct;
  {$EXTERNALSYM tagCOPYDATASTRUCT}
  tagCOPYDATASTRUCT = packed record
    dwData: DWORD;
    cbData: DWORD;
    lpData: Pointer;
  end;
  TCopyDataStruct = tagCOPYDATASTRUCT;
  {$EXTERNALSYM COPYDATASTRUCT}
  COPYDATASTRUCT = tagCOPYDATASTRUCT;