I use Firefox as default browser in my computer.
I need to develop the web application(JSP) project in Netbeans 6.5 and everytime I run the project, it run in Firefox.
I want to run my web application in IE for testing but not change my default web browser.
In Netbeans 6.5 under Tools->Options->General there's an option on top called Web Browser. Did you try to change that? Doesn't that work for you?
[Edit]: Maybe you have to make changes that way