Hi, JamesCR! If the scrollable windows you want to capture are webpages, then you can go to screenshot.net and navigate to “Webpage Screenshot”. This Webapge Screenshot Capture allows you to capture entire webpage including the region that extends beyond your screen by entering the URL of the websites you want to capture. After that, you can choose the image quality and format you want. Once settings are done, you can save it to the Cloud space or your local hard disc.