The System Buttons

On the right side of the title bar, three buttons allow you to manipulate the application as a window object. On all the windows we have used so far, the system buttons are located on the extreme right side of the title bar. Depending on how the application was configured, the computer can display one or three of these buttons at a time. These buttons are:

Name
Close

Description
This button allows you to dismiss a window that is currently opened. To use it, simply click it. This makes its window disappear. Depending on how the application works, you may be asked a question before the window is actually closed. If you have closed a window with this button and you want the window back, you have to reopen it.
Minimize
This button allows you to reduce the presence of a window to the Taskbar. The window doesn't get closed but it disappears from the screen. If you want to bring the window back, from the Taskbar, click its name. After clicking this button, the window is said to be minimized.
Maximize
If a window equipped with this button is occupying only an area of the screen, you can click this button to fill the whole screen with only this window. If there are other windows on the screen, they don't get closed but they disappear, making their presence be known only by their name or button on the Taskbar. After clicking this button, the window is said to be maximized.After a window has been maximized, this button is replaced by another button: the Restore button.
Restore
This button is used to restore a window if the window has been maximized. If you click this button, the window gets the size it had prior to being maximized.