[[duilioisola]]

Aquí hay otra opción http://stackoverflow.com/questions/7...-a-delphi-form

Código Delphi [-]
procedure TForm1.Button1Click(Sender: TObject);
var
  Rec: TShellExecuteInfo;
const
  AVerb = 'open';
  AParams = '';
  AFileName = 'Notepad.exe';
  ADir = '';
begin
  FillChar(Rec, SizeOf(Rec), #0);

  Rec.cbSize       := SizeOf(Rec);
  Rec.fMask        := SEE_MASK_NOCLOSEPROCESS;
  Rec.lpVerb       := PChar( AVerb );
  Rec.lpFile       := PChar( AfileName );
  Rec.lpParameters := PChar( AParams );
  Rec.lpDirectory  := PChar( Adir );
  Rec.nShow        := SW_HIDE;

  ShellExecuteEx(@Rec);
  WaitForInputIdle(Rec.hProcess, 5000);

  fNotepadHandle := Windows.FindWindow( 'Notepad', nil );
  Windows.SetParent( fNotepadHandle, Handle );

  Resize;
  ShowWindow(fNotepadHandle, SW_SHOW);
end;

procedure TForm1.FormResize(Sender: TObject);
begin
  if IsWindow(fNotepadHandle) then begin
    SetWindowPos(fNotepadHandle, 0, 0, 0, ClientWidth, ClientHeight,
      SWP_ASYNCWINDOWPOS);
  end;
end;