BrowserLab can be used directly in Dw - no need to copy the URL. Once you are in Dw and you have your main page loaded in the editing region of Dw you can goto menu bar: File -> Preview in Browser -> Adobe BrowserLab; This will launch a seperate browser window with Adobe BrowserLab. Once you are logged in you web page and related assets will be automatically sent to BL and sreenshots will be returned. You can also get to BrowserLab from within Dw via the Files panel, right click on your main page and select Preview in Browser -> Adobe BrowserLab; Finally you can get to BL via the CSLive panel.
Thanks - Mike