System menu

• "Info" menu item
• "Special preferences" menu item
• "Depth subdivisions" menu item
• "Analyse" menu item
• "Optimise" menu item
• "Design defaults" menu item
• "Graph positioning preferences" menu item
• "Graphics output preferences" menu item
• "Labelling preferences" menu item
• "Graph grid preferences" menu item
• "Dimension lines" menu item
• "Display system" menu item
• "Display results" menu item