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how to Hiding the Computer?

In web sites of many personal firewall companies, they are putting a lot of weight on the ability of their firewall to hide the computer on the Internet. Yet, exposing your home computer on the Internet is by itself, neither a security nor a privacy threat. If you provide some services to the Internet on your computer, for example, you put a web server on your computer to allow other people to view web pages, then you might get rid of some of the crackers, by setting your firewall to unhide only this type of communications. Some attackers will not make a full scan of your computer, but only a partial scan, and if they did not scan for the specific service that you provided, they will not see your computer. Yet, if the service is a common one, there is a good chance for many of them to scan it and thus find the existence of your computer. If they "see" the existence of your computer, they might decide to scan it further, and find out the services you are providing, and scan it for security holes to use. Yet, there is no much meaning to it when we speak about simple home computers.

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