One browser, multiple open windows and sessions

[eluser]billmce[/eluser]
I never phrased the question properly, lemme try again.

I'm looking for a technique where I can write CI session info and distinguish that info (somehow) to allow for a user, using one browser with multiple windows open on the application, to read/write session info pertaining to the appropriate window.

I'm aware that there is only one session per site per browser. What I'm looking for is a technique to use that one session effectively in the above scenario.