Except for the slide-show screensavers that display a sequence of images, screensavers generally move an image, piece of text or animation around the screen. Most screensavers offer some combination of these features. Require a password to turn it off and return to the desktop.Provide the ability to interact with another program or a Web site (For example, the HowStuffWorks screensaver keeps the mouse active, which allows you to click on several different icons to access specific areas of the HowStuffWorks Web site.).