[MiKTeX] Unicode Cuneiform font

[A. E. <er...@fh...>]

Hello,
 
can anybody please give me some help on how to include cuneiform signs into my XeLaTeX document?
(ideally with a minimum example).
Here is the list of signs (actually, the pdf file under "Weblinks" at the bottom) I would like to use:
http://de.wikipedia.org/wiki/Unicodeblock_Keilschrift
 
and here is my sample file

 
\documentclass[11pt]{article}
\usepackage{fontspec}
\newfontscript{Sumero-Akkadian Cuneiform}{xsux} %???
\begin{document}
\section{Unicode support}
 \subsection{Cuneifom}
.... %??? (how do I insert the signs?) 
\end{document}
with lots of things tried between the  \subsection{Cuneifom} and the \end{document} statement,
without success. 
 
Maybe I also would have to modify my fontspec file.
I see a file fontspec-xetex.sty
in my MikTex/tex/latex/fontspec/
folder, but I am not sure where (or if one is allowed) to change it.
 
I am running MiKTex 2.9 on my Windows XP PC.
 
Thank you very much in advance
 
Angelika