A. the start button

B. running applications (and toolbar)

C. system bar toolbar

D. clock

Start Button

Tap the start button to get access to the start menu.

Running Applications (and toolbar)

Running applications show all the current applications.  Note that it is not able to show a large number of opened applications.  Click the toolbar to see the full list.

System Bar Toolbar

See System Toolbar to learn how to set these items.

Clock

Tap the clock to display time settings.