Creating domain and default page

Hi all, Can anybody give me a guideline or idea on how to write a PHP scriot which is used to create a domain or sub-domain and a default page and a same time. My OS is Red Hat Linux 6.1. For example, in my program, when i press "activate' button, the script will create me a sub-domain try.php.com and a default page index.php is created for that sub-domain. Thanks for advice...... _________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com.