title: Invisible Character
body: <p>Does anyone know if there is any invisible character in Unicode strings other than the space? Like in windows 98 there were some tricks using ALT+some integer (in fact bugs <a href="http://forums.techarena.in/customize-desktop/1121437.htm" rel="nofollow">http://forums.techarena.in/customize-desktop/1121437.htm</a>).
  Is it possible to programmatically add some such characters that are not shown by any editor?</p>