i have one router '/customer/account/create/', where in magento we config it?
and how to know what action process it?
Magento has complex url rules, but to get you started quickly, most of the time you can assume its in the folowing format
Router is defined by module, controller is defined by the controller class name (file name), action is the action method name in that controller. So if you open app/code/core/Mage folder, you will find a Customer folder, which is a module, an AccountController.php inside its controllers folder, and createAction in this controller file, which is what you are looking for.