session cookie in netscape

[Guest]

Basically, I need a variable that is UNIQUE TO EACH BROWSER WINDOW.

By setting a cookie with no expiration date in an IE browser, I create a
session cookie where the cookie value is held in the memory of the browser
and is gone when the browser is closed. HOWEVER, the doing the same thing in
a Netscape browser seems to actually write the cookie to a file and make it
available to all browser windows. Is there a way I can replicate the IE
'session cookie' behavior in Netscape?

Thanks for your help

Earl