How to maintain same user session between a parent website and its virtual directory?

Hello there,

I have a parent web site (https://mysite.com) and a virtual directory under it (https://mysite.com/myvd). Both have the session state as 'In process' and runs under different app pools.

Now in my application, from parent site I am opening the pages in VD in an iframe. Say If I click log out now from the parent site. My Parent site's session is getting over however my VD's session (user context) is still there.

To address this issue, is there a way like I can maintain same session between both the parent site and VD?

Thanks in advance.

Vetrivelmurugan