How to enable multi-domain sites hosted on the same appache?

Now, I have one server, I want to host more and more websites on the same machine.
The server runs zend server ce (appache2)
Assuming three sites: www.a.com and www.b.com and www.c.com they will both runs on the server.
a.com will have the root directory of the appache;
b.com will have the htdocs/b/ directory, c.com will have the htdocs/c/ directory.
Who can tell me the detail configuration steps to implement that?

Thanks
matiascxAsked:
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PapertripCommented:
This is very common and is pretty straight forward.  For a basic vhost you only need to make a few changes.

Check out this page first http://httpd.apache.org/docs/2.0/vhosts/
If each website will have it's own IP then use IP-based virtual hosting, if they will share the same IP then use name-based.

The DocumentRoot option says where on the server the content will reside on the filesystem for any given vhost.

More info -- http://httpd.apache.org/docs/2.0/vhosts/examples.html

Name-based example:
# Ensure that Apache listens on port 80
Listen 80

# Listen for virtual host requests on all IP addresses
NameVirtualHost *:80

<VirtualHost *:80>
DocumentRoot /www/example1
ServerName www.example1.com

# Other directives here

</VirtualHost>

<VirtualHost *:80>
DocumentRoot /www/example2
ServerName www.example2.org

# Other directives here

</VirtualHost> 

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matiascxAuthor Commented:
Hi, Papertrip,
Thanks to your information, I have succesfully solve the problem. But a new question:
Now, www.a.com ->htdocs/a/  , I have the requirement that: when the user enter www.a.com/root SHOULD be rooted to the htdocs/root  NOT the htdocs/a/root.   How can I implement that?

Thanks!
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