When a request for a page is sent by a browser , this request is received by the server hosting a drupal site. Suppose a request is sent for the page http://drupal.org/user/1 this request is received by drupal installation directory as URL user/1.
We have an .htaccess file inside drupal installation directory which is read on every request.
You can easily intergrate drupal coding standards, files extention using following file. Netbeans Config.zip
On netbeans,
Goto : Tools->Options