1. In htacces file index.php page will be mentioned as first processing page of drupal.
2.In index.php bootstrap.inc file has been included which is core part of drupal
3.Then a function menu_execute_active_handler() is called
4.In the above function will check whether any call back is there at address bar else it will get the default call back defined in drupal.
5.menu_execute_active_handler() WILL also check whether there is any access denied for this callback,site is offline,callback not found.
6.Drupal will process this callback return the page content in string.
7.Then Drupal theme the string content by calling theme_page function
8.drupal_page_footer() is called to display the footer content
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