Actually，the whole process is very cool.In the 1980s，you could sit down at a computer at any big university.Up to 100 people would be logged in and share the computer because these computers were very expensive.You could type a command to send an instant message to anyone logged in the same computer.It felt like everyone was connected together no matter where they were sitting.

　　Today，you can communicate with anyone in the world.All you need is an instant messaging program installed on your computer.There are many programs to choose from.AOL's instant messenger is probably the most popular right now.MSN has one.Google has Google Talk.

　　When you're ready，you create an account.Next，you need to figure out the IM names your friends use.Add their IM names to your IM program.Click on the friend you want to talk to and then type away.When you click “Send”，your friend gets the message instantly.

　　But behind the scenes，amazing things are happening.Your IM program is communicating with a computer，called a server，which could be just down the road or even in some other city.All your friends' computers are communicating with a server，too.Your computer is constantly chatting with it

　　to make everything happen.The network called the Internet makes it all possible.

　　【语篇导读】　本文是一篇说明文，主要介绍了目前网上最流行的交流方式——即时通信。

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