Pop-up windows often open as soon as you visit a website and are usually created by advertisers. A pop-up blocker is a feature in an internet browser that limits or stops most pop-ups from being viewed. When a pop-up blocker is enabled, an information bar message will usually appear at the top of your screen saying either "Pop-up blocked. To see this pop-up or additional options click here" or "To help protect your security, the internet browser blocked this site from downloading files to your computer. Click here for options."

There are a few places on PeriStats where pop-up blockers prevent the user from downloading slides or data summary pages. To temporarily allow a pop-up, so that this important information can be displayed, hold on CTRL (or press CTRL+ALT) as you click on the website link. .