The forward and back arrows on the toolbar let you go back to previous documents you've visited and then move forward again to the other documents visited in this session.
The history list is not a comprehensive list of visited documents. Rather it is the "shortest path" between your current document and your home page. For example, suppose from your home page you browsed through documents A, B, and C (sequence 1 below). Your history consists of four documents: your home page, A, B, and C. If you return to file A using history, the history list consists of the four documents. However if you now follow a different path from A to document D (sequence 2) history is truncated to follow just this new path. The history list now consists of the home page and document D (sequence 3).
History contains a linear history of the files you have viewed, which means that only those files in the current tree structure are stored.
To load a file when the URL is listed in History either: