Agelong Tree builds family trees (or genealogical trees) based on information about persons and about the events which unite people into families. A genealogical tree can be constructed for any person selected in the table, this person is called the root of the tree:

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In the tree options you can configure the contents of the tree (= the set of people displayed in the family tree), the tree view, the content and the appearance of persons in the tree (they are called tree nodes). The nodes of men are displayed in rectangles, the nodes of women are rectangles with rounded corners:

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You can move (scroll) the tree using the scrollbar, scroll wheel or holding the left mouse button and moving the mouse. When you click on the tree node, this node becomes active and is highlighted with a blue border, and you can also use the cursor arrows to move from one person to another. Double-clicking on the tree node opens the person's information window or person's edit window, depending on program options.

The actions in the upper half of the context action bar to the left of the tree (Create, Edit, etc.) apply to the active node of the tree. The same actions are available in the context menu of the tree node, the menu is called by the right mouse click on the tree node. The actions in the lower half of the context action bar apply to the tree as a whole, the same actions are available in the context menu of the tree, which is called by the right mouse click between the nodes of the tree:

• Tree options – tree options dialogue box is displayed
• Rebuild – the tree is rebuilt, for the same person and with the same settings
• Zoom – selects the scale of the tree view. The tree is also scaled with the mouse wheel while holding down the Ctrl key
• Full screen – switch to full-screen view of the tree. Double-clicking the left mouse button between tree nodes also switches the tree to this mode
• Save – saving a tree in one of the available formats (PNG, SVG, HTML)
• Print - go to print preview, where you can print a tree and save the tree by pages in PDF format