Many important documents on this website are available for download in
user friendly Acrobat pdf versions. They are marked like this:

Pdf is a special document format which allows display and printing in a fixed layout.
To open a pdf file, the free software Acrobat Reader has to be installed on your system. It can be downloaded from this link on the Adobe website. If you click on the link shown above, the pdf document opens in a new window and can be printed by pressing the print button in the menubar at the top of the window.

Some pages are not available as pdf documents. These can be printed by clicking the "print view" link at the top right of the page. The print view opens in a new window and can be printed by clicking the "print this page" link.

The navigation consists of two different elements.

The top navigation contains different sorts of service elements. You can contact us or download files or view the link list.

The navigation in the left frame leads you through the contents of the page. If you click on a menu element, the menu unfolds and shows all the themes that you can find under this main menu.

If you want to find specific content, please use the "Search" button in the top navigation or the search dialog in the left frame.