How to get the Drupal Documentation

Hello,

My name is Judah. I am new to Drupal (about 2 months). I like it and all 
that is providing. I plan to help out when I get a better understanding.
I would like to know how to get a side block similar to the Drupal 
Handbook (http://drupal.org/book/view/253). It has the title at the top, 
the categories below it and clicking on a branch opens that branch. How 
can I do that?
I have the book module installed.

Thank you,

Judah


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