http://blogs.msdn.com/densto/pages/dynamic-querystring-correlation-custom-extraction-rules-and-webtest-plug-in.aspxOverview: What in the world is Dynamic QueryString Correlation? Dynamic QueryString values change each time a web page is viewed, they may be a unique session id or some other variable in the web application that is unique to the current user or session.en-USCommunityServer 2.1 SP1 (Build: 61025.2)http://blogs.msdn.com/densto/pages/dynamic-querystring-correlation-custom-extraction-rules-and-webtest-plug-in.aspx#1913637Mon, 19 Mar 2007 19:03:45 GMT91d46819-8472-40ad-a661-2c78acb4018c:1913637Dennis Stone's Blog<p>Here is an article with some custom rules and plug-ins that you can use to apply dynamic querystring</p>