is it possible to display a title of a cms page in the content of a cms page?
if yes, is it possible to display the title of another cms page?
By default, it's displayed. If you're using custom theme, then it depends on your theme implementation.
Not sure what did you mean by "display the title of another cms page", give some examples.
i want to use the title of a certain CMS-page in the title-tags of links (<a title="...."></a>) on other CMS-pages