有关计算机的基本问题～

请用中文回答下列有关计算机的英文问题～（每一条都答，谢谢！）
Operating a Personal Computer
How do you turn a destop computer on and off?
What are the parts of a desktop computer?
What are peripheral devices?
What does Windows do during the boot process?
What does Windows do when it is in sleep mode?
What are screen savers?
How do you open a program from the Start Menu?
How do you close a program if it has stopped responding?
How do you shut down your computer correctly?

Browsing and Searching
How can you browse a web page?
How can you change your home page?
What is a URL?
What are the main causes of a bad link?
What do the Home, Back and Forward buttons do?
How do search engines find web pages?
What is a wildcard? *

Using E-mail
What are the steps in signing up for an e-mail account?
How can you check your spelling before sending e-mail?
What folders are in your mail box?