Making Sub-domains.

Hi , my name is Oliver, I have 14 years old , and I am from Brazil. I am Developing php for 4 month, But I am having very Good Results! But now, I am with a problem: I will Know how does the Link like that: http://NAME.mysite.com Go to mysite.com/index.php. But, when I try to do the test, the link go to the http://NAME.mysite.com/index.php . My question is: With php, can we make it? But, it couldn´t be with a subdoamin maked manualy... I will that, independently of the name of the subdomain he goes to mysite.com/index.php . Thanks for the attention... Congratulations of the site and the programming... My web site is www.trakinar.com.br , and my e-mail is gulliva@terra.com.br Bye.