Andreas Röhler <andreas.roehler@easy-emacs.de> writes:

emacs-version is the info, which I want to see at top.

dired-other-frame was just an example of a command, which displayed it
according to my setting. Commonly, the host-name is shown at this
place.

What "top" are you referring to? Is it the title bar of an iconified
window?  (I don't believe XFCE has such a thing)

It's about the display of icon-title-format's content. Which is shown on top of Emacs as emacs@foo for example. Where foo is the hostname here.