Recently a topic with cross domain login was posted to integrate CPG on one domain with forum of another domain. As it was responded that is not currently available in php. However i came across these articles which discuss cross domain logins using data/cookies of one domain to another. I am not web programmer so i would like to know what developers have their say on it.
http://www.daniweb.com/code/snippet494.html
http://www.troywolf.com/articles/php/class_http/