TIP 
1/5
Doubleclick on contentareas will go ahead in topic.
2/5
accesskeys
[Alt] +
1 - home
2 - external online-help
3 - sitemap
4 - contact-form
5 - legal notice
9 - go back in topic
0 - go ahead in topic
3/5
[Strg][F] - will find search-terms within opened pages.
4/5
[shift] + mouse-wheel - page: ahaed / back (visited pages)
[Strg] + mouse-wheel - Font-size: scale up / downsize
5/5
Presentation (Beamer):
1.opt for eBook or main-topic.
2. [F11] - full-screen.
3. hide bothering areas. (-/+ keys)
4. adjust font-size. (reading-glass -key + scale font-size.)
Go forward within presentation per doubleclick.
