At the top edge of the window, inside its border, is the title bar (also referred to as the caption or caption bar), which extends across the width of the window. The title bar identifies what the window is viewing. It also serves as a control point for moving the window and an access point for commands that apply to the window and its associated view. For example, clicking on the title bar with mouse button 2 displays the pop-up menu for the window. Pressing the ALT+SPACEBAR key combination also displays the pop-up menu for the window.