http://www.mysite.com/welcome.html?foo=1:http://www.mysite.com/welcome.html?foo=1&name=value pair to the end of it to create a unique link. For example, suppose you already have this link which has the existing query string ?newvisitor=yes:http://www.mysite.com/welcome.html?newvisitor=yeshttp://www.mysite.com/welcome.html?newvisitor=yes&foo=1| What is a Query String? |