joomla integration with language switch and logout

according to this url (http://www.asprunner.com/forums/topic/13251-phprunner-and-joomla/), i could integrate partly with joomla.

1. Could I pass language parameter so that i could predetermine the language interface after auto login?
   eg. when not using with joomla
   
   http://www.abc.com/phprunner/2/login.php?language=Chinese%20%28Taiwan%29
   
   http://www.abc.com/phprunner/2/login.php?language=English
   I have tried below and does not work when this is put into WRAPPER URL
   
   http://www.abc.com/phprunner/3/jos_users_list.php?language=Chinese%20%28Taiwan%29
   
2. i want to logout phprunner and then logout joomla automatically. One method is to run a URL like below to logout joomla, too.
   www.abc.com/index.php?option=com_user&task=logout&return=L2luZGV4LnBocD90cD0x
   Pls advise how to make phprunner to run this url after logout?