The Movement Icons

This icon allows you to go back one page. This is not the same as the back icon on the toolbar, this icon enables you to follow the documentation like the normal paper based form, rather than having to hope you have seen all the pages.
This icon always take you to the main index.
This icons takes you back a section. Sort of like a going back to a chapter heading.
This icon allows you to forwards one page. This is not the same as the forwards icon on the toolbar, this icon enables you to follow the documentation like the normal paper based form, rather than having to hope you have seen all the pages.
Of course some of the icons may be missing, it all depends on what is appropriate for a particular page. This one for example only has Index and Next icons as the Previous and Index icons would lead to the same place and this is the only page on this Subject.