Testing Multiple IE Versions, VPC’s and Super Preview
It’s been almost 2 years now since we first shipped the Internet Explorer testing VPC’s so that you could test IE6 and at the time IE7 on the same machine. We understand the need for people to test IE6, IE7 and IE8 on the same machine, and remain committed to shipping the VPC’s! The VPC’s will remain an important component of testing your sites, because they give you a real, and accurate way of seeing how your site interacts with not just rendering, but JavaScript, and other components in the browser. But there’s a new option that will work fantastically for testing layout and rendering of pages, Expression Web SuperPreview. SuperPreview allows you to compare multiple rendering engines side by side, or even super-impose
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Read the complete post at http://blogs.msdn.com/petel/archive/2009/07/20/testing-multiple-ie-versions-vpc-s-and-super-preview.aspx