Atk-app menu session-vars across multiple tabs of a browser

I have a running atk app. i use session varibles in nodes to send values to child-node or popup nodes. Now Users have a habbit of opening same menu ie node options in multiple tabs of the same browser. An open diff records in diff tabs for ref. Now session is same so the session vars get overwritten by the latest tab opened. Then user suddenly shift to Fst Node and try doing some operations - by which the session vars are of the latest tab opened - and wrong postings happen.

Any clues how to overcome this?