<p>
  Access to the workbench shelf is through the tabbed pannel on the left
  of the workbench. The following figure shows the shelf.  
</p>
<br>
<br>
  <img src="images/lwb_shelf_overview.png" alt="Workbench Shelf" border="3">
<br>
<br>
<p>
  Here you can see the shelf has various sub-categories denoted by the book icons. In
  addition we see some subsystems in the sub-categories, denoted by the small pipeline icon.
</p>