We have a website that has a common logon page. A user chooses which site they want to use when they login and that site opens and the user has access based on their security. 

In IE6 and IE7 a user can open 2 instances of IE and logon to 2 different locations and they work independently. 

Using IE 8 or even chrome if a user logs in to one site and then opens another instance and goes to the logon page the site loads the same application the user is already in. Is there a setting somewhere to open IE or Chrome sessions in a separated sandbox?

Even though i exampled chrome, our endusers who this fix are for are IE8...sorry for the confusion.