Acknowledgements

I want to thank the following people:

• My parents Rolf + Renate Hildner who allowed me to go to university and gave me all the freedom.
• Some girls for warmth + tenderness.   =8-)
• Gerhard Muth for (sometimes) being patient.
• Frank Frauenhoffer for (always) being patient during my master's thesis.
• Tony Towfighi, Zia Zahiri + his family for giving me a start in the US.
• Johannes Gamperl for the JavaScript menu system used on this web site,
  along with the modifications by Roland Wagner and myself.
• xemacs.org for their syntax-highlighting + programmable editor.