1st Clicks is a program for parents of young children that hides the computer desktop, and replaces it with a screen containing a list of a few games, programs and websites that parents have made accessible to their children. Your children cannot access the original desktop, and so they cannot run other programs and cannot play games outside of this list, even if they are installed on the computer. In the same way, only the websites in this list will be accessible. Since they don't have access to the original desktop, they cannot cause any harm to files or change any settings.