A menu bar is a bar at the top of the active window that displays the names of all the menus that are available in that window at any given time.
To choose the command associated with a menu item, the user points to that item, then clicks the mouse button. The system then closes the drop-down menu.
To use the keyboard to access drop-down menus, the press the ALT (or F10) key to activate the menu bar. When an alphanumeric key is pressed while the Alt key is hold, or after the Alt key is released, the system displays the drop-down menu whose access key matches the alphanumeric key pressed.