Creating/Changing WordPress Cookies externally

I am working on a login system that creates several cookies at once (for several open source software systems, such as wordpress and phpbb). To do this I have created a login page that directs information to a page that creates cookies specific to each section of my website.
(My website is http://www.mediacityonline.net).

My wordpress blog is located in the directory http://www.mediacityonline.net/news, and my login page is located in my main directory (www.mediacityonline.net/login.php). Is there anyway I can call wordpress functions to create a cookie from information sent from login.php to loginck.php (loginck.php is the page that actually creates cookies, and takes posted information, and creates variables($_POST[”] = $var;).

I have managed to do this with phpbb and an account system I made so far, but is there anyway this can be done with wordpress.