Share data among Provider hosted App Parts in SharePoint 2013

I have a requirement to share user session data among App Parts that reside on a SharePoint 2013 web part page.

The App Parts are Provider Hosted. The host is another IIS web application.

My understanding is that connected web parts used in 2010 is not applicable in this scenario. Also, I can't use Query String filter web part to pass the information through URL either.

If I can access the session ID from my App Part, I can implement my own user session management to share data. But I am not aware of any way to access the session ID from a App Part either.

Any suggestion will be greatly appreciated.

Thanks!

John Architect