Opening and closing subtrees
First, you should know how to open and close subtrees, and to expand and collapse your tree. To the left of each node that is the root node of a subtree (i.e., is a parent node with child nodes attached) is a small square box containing a plus sign (+) if the subtree is collapsed or a minus sign (-) if the subtree is already expanded. Simply click the box to open⁄close the subtree. Applying this to the Root node will open and close the whole tree.
(The term toggling is used to describe an action which switches back and forth between two states, depending which one is current. Pressing the same button to turn a light on⁄off is an example of this. Clicking the node's box icon as described above can be termed toggling the subtree open⁄closed. If you encounter any unfamiliar words you should check the Glossary.)
Since subtrees can be several levels deep, TreePad offers us the choice of expanding just the top level, or all levels (which makes all nodes visible but also makes the tree longer to navigate). To dispel confusion, we will use the terms open and close when referring to just the top level of the subtree, and expand and collapse when referring to all levels. Toggling the node's box icon opens⁄closes the subtree.
Since you may prefer to use the keyboard to open⁄close subtrees, here are some handy shortcuts.  Pressing Left arrow or "+" (Numeric keypad) closes an open subtree. Pressing Right arrow or "-" (Numeric keypad) opens a closed subtree.
(The LeftRightUpDown arrow keys and the PageUp, PageDown, Home and End keys are also known collectively as the cursor keys, so this term will also be used to refer to them.)
There are also menu commands and toolbuttons for these commands. For further details see Expanding and collapsing subtrees.
Let's discuss the basic tree navigation commands.
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