sattarpatan

Hi Every body, I have a domain call http://mywebsite.com and i have created two sub domains under main domain 1. http://demo.mywebsite.com and 2. http://core.mywebsite.com.'>http://core.mywebsite.com. I have installed my whmcs into http://core.mywebsite.com and i have my custom pages(.php) into http://demo.mywebsite.com. When the customer come to my website i am taking him to http://demo.mywebsite.com and displaying products list from here if the user want to purchase the product i am redirecting to http://core.mywebsite.com.'>http://core.mywebsite.com. In core if the user once login i want to carry the session from http://core.mywebsite.com to http://demo.mywebsite.com. I have reviewed so many articles nothing is working. Please provide me the the solution. If any problem carrying session one sub domain to another, please let me know. Thanks.