Magento: Redirect functions

The redirect functions are present in Mage_Core_Controller_Varien_Action class.

/* Redirect to certain url */
_redirectUrl($url)

/* Redirect to certain path */
_redirect($path, $arguments=array())

/* Redirect to success page */
_redirectSuccess($defaultUrl)

/* Redirect to error page */
_redirectError($defaultUrl)

/* Set referer url for redirect in response */
_redirectReferer($defaultUrl=null)

/* Identify referer url via all accepted methods (HTTP_REFERER, regular or base64-encoded request param) */
_getRefererUrl()

/* Check url to be used as internal */
_isUrlInternal($url)