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The Contents tab contains a list of all the online help sections, topic and sub-topic pages contained in this online help document. 

The sections and topics are displayed as a tree view hierarchy.  This layout is called a “tree” because each node is like the branches of a tree.  This display is like the way folders and files are displayed in the left pane of the Microsoft Windows Explorer screen. 

To the left side of each node is a small [+] symbol.  If you click on the [+] symbol, the node will open and you will see all the sub-topics listed under that node.  Some of these topics themselves will also have a [+] symbol next to them.  Again, this means that there are more sub-topics contained within that particular topic.  If you click on the [+], it will open the topic list to reveal the contents and change the [+] to a minus [-] symbol.  This simply means that the topic has been opened accordingly.  If you click the [-] then it will close the topic and return it to the [+] symbol.