2. Open the Tutorial Icon.

Click the icon labeled Tutorial (shaped like a file folder) in the System.Disk window. Then choose Open from the File menu.
The Tutorial icon opens into a second window, in front of the System.Disk window.

Figure 2-19 Active and inactive windows
 

Note that the appearance of the System.Disk window has changed. The title bar no longer has its four horizontal lines, and the window no longer has scroll bars, proportional scroll boxes, a zoom box, or a size box. These are indications that the window is no longer active.
The active window, which always appears in front of other windows on the desktop, is the location of whatever action you perform next.

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Chapter 2: Getting Started: A Hands-On Tutorial