This is with respect to Session. If the client uses multiple Internet Explorer, they will be getting different session provided the browser is not opened using ctrl+n or File>> New >> window.
Whereas this is not causing a problem in Opera and FireFox.
How to set the IE to reflect this ?
If the computer has less than 32 megabytes (MBs) of RAM installed, this setting is disabled and all instances of Internet Explorer share the same process. If there is 32 MBs of RAM or more installed on the computer, the setting is enabled, which causes new instances of Internet Explorer to create new processes.
You cannot guarantee session state to be maintained over multiple windows. If you need to maintain data over multiple windows, use a key in the query that is tied to a cookie or a bean.