The Help-Button is for showing this Help-Page.

The "Up-Arrow"-Button links to an upper level page.

The "Right-Arrow"-Button links to a next page.

The "Left-Arrow"-Button links back to a page.

With this button you can switch to the German Version of a page.

With this button you can switch to the English Version of a page.

The Index-button shows you an alphabetic sorted list of titles.

The Envelope-Button is for writing Mail to the author of this pages.

The ©-Symbol gives you an information about the copyright.

After click on the title the upper and left navigation frames will removed to give more space for the page content.
With another click on the title the nagivation frames will be displayed again.

You can change the topic with a click on a topic in the upper navigation bar.

An overview page with pictures of the current topic is shown after a click on a the topic in the left navigation menu
or after a click on a picture.

A link with this symbol is an external link to a different web site.
The external link will be opened in a new browser window.