Memory
How do program instructions transfer in and out of RAM?
p. 195 Fig. 4-19
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Step 1. When you start the computer, certain operating system files are loaded into RAM from the hard disk. The operating system displays the user interface on the screen.
Left Arrow: Operating system instructions
Operating system instructions
Left Arrow: Web browser instructions
Web browser  instructions
Left Arrow: Word processing program instructions
Word processing program instructions
Left Arrow: Operating system interface
Operating system interface
Left Arrow: Web browser window
Web browser 
window
Left Arrow: Word processing program window
Word processing program window
RAM
RAM
Left Arrow: Web browser program instructions are removed from RAM
Web browser program instructions are removed from RAM
Left Arrow: Web browser window no longer is displayed on desktop
Web browser window no longer is displayed on desktop
Step 2. When you start a Web browser, the program’s instructions are loaded into RAM from the hard disk. The Web browser window is displayed on the screen.
Step 3. When you start a word processing program, the program’s instructions are loaded into RAM from the hard disk. The word processing program, along with the Web Browser and certain operating system instructions are in RAM. The word processing program window is displayed on the screen.
Step 4. When you quit a program, such as the Web browser, its program instructions are removed from RAM. The Web browser no longer is displayed on the screen.