Book Marking is the process of producing index like entries with "go to" links to the left of
the document content.
It greatly improves the readability of a document and as Shoes so rightly points out offers
a method of taking you where you want to be in the content without having to scroll up and
down all the while.
The document structure is further improved by indenting sub headings so that the flow is
apparent.
And, yes Shoes, I am unemployed...Boohoo!!