want to access the session from external script in joomla

[amitbhoria]

hello , i am using an external script in joomla, for pdf generation , it works fine, but i want to generate pdf of an internal page, whenever i send a request from that page to print pdf of specific page, it logouts the user and return a pdf of ligin form, the issue is for a security reasons joomla session denys the request from external script. i tried to set session on external page and tried to get it in internally but it fails... please help me out, that how can i get the current user sesssion on external page and redirect it to correct path with current user session without logging it out.
please help me out.

Thanks

[iextensions]

after login, get user info, then you can use ajax and load info to external page. OK?