...change the caption of other applications?

{
  If you want to change caption of other runnung application try this command:
}

procedure TForm1.Button1Click(Sender: TObject);
begin
  SetWindowText(FindWindow('notepad', nil), 'Hello!');
  // or:
  SendMessage(FindWindow('notepad', nil), WM_SETTEXT, 0, Integer(PChar('Hello!')));
end;

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