The icons on the desktop represent collections of information. The System.Disk icon represents all the information stored on the Apple IIGS System Disk. The Trash icon represents all the information you have discarded since the last time you emptied the Trash. (At present, there isn't any information in the Trash.)
When you want to know in more detail what's represented by an icon, you can open the icon to see what's inside.
Follow these steps to open the System.Disk icon:
1. Click the System.Disk icon to select it.
2. Choose Open from the File menu
When you release the mouse button, a large white rectangle, known as a window, appears on the screen. This window contains icons representing the contents of the system disk.
For additional methods of opening icons, see Chapter 3 of the Apple IIGS Owner's Reference.
Session 2: An introduction to the Finder