Some windows are divided into separate viewing areas or panes. You often see a navigation pane and a pane with content. Panes can either be static or moveable. Use lowercase to describe a pane that does not have a name or title. The following are examples of panes:
A navigation pane with tabs or a hierarchical structure.
A content pane that contains fields, switches, and other UI elements. For example, after clicking a tab, you see a content pane with the settings you must configure.
A preview pane that you use to view content before printing or publishing it.
The reading pane that you see after clicking an email message in Outlook.