Each screen has tabs. Each tab is a view. Each view has its own set of fields where information can be entered or viewed. Views can contain not only fields for entry, but they can contain embedded filters, for easy object retrieval, and folder contents, for easy document retrieval. Tabs may vary by class.
You can move to the next tab to the right by pressing Ctrl + [. You can move to next tab to the left by pressing Ctrl + ].