But when I do the Recording on the web application, the created script is not looked like as the WebTest User's Guide descripts. (As the Guide descripts it should have function like web_link_ function, but I always get mouse_click_function when I click on a link, frame, buttons...) And when I run the recorded script it doesn't open the pages and links as I did in recording. I don't know what's wrong. It seems that WinRunner doesn't work well on testing web application. But the WebTest User's Guide sounds so good. Are you use it testing web application?