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I had this issue awhile ago as well. My solution, (since there is not this option within the web console), was to run various linux virtual machine in just regular old vmware player, and have them each full screen with a browser and different logins. You can use a tiny linux OS that only really has web browser installed, and dedicate like 384Mb of RAM to it.
Internet Explorer shares session between instances. To prevent this, use the new MSIE 8 and open a new window using File - New Session. For more info, see http://news.softpedia.com/news/Internet-Explorer-8-New-Session-111037.shtml
You may also use two different browsers to achieve the same result (like FF + MSIE)