Keep session active in one URL when user in navigated to another URL
My site name www.test.com. I have a hyperlink in one of the page. If the user click the hyperlink they will be navigated to different site www.newsite.com. Now the user starts doing some activity in www.newsite.com. As long as they are active in www.newsite.com, session should not expire in www.test.com. For example, if the user is active for 2 hours in www.newsite.com then the session should be active for 2 hrs in www.test.com even though i have set the session time as 20 mins in web.config.How to achieve this?
I searched in web.In most places Keepalive functionality is suggested but in that they are using iframe. I hope client will not accept loading the newsite.com URL form test,.com site because of security issues.
Please suggest in detail.