Title bar

The title bar shows the System Menu icon, the title of the window or name of the program being run in
the window, and the buttons for resizing and closing the window. The title bar alone offers some handy
features:
To expand a window to full-screen size or to shrink it back to its original size, double-click
its title bar.
To move a window to some new location on the screen, drag the window by its title bar.
Tip Remember, to drag something means to put the mouse pointer on it and then to
hold down the mouse button while moving the mouse. You can move a window
only if it’s smaller than the entire screen.