Parents could provide a password that their children could use to access content that would otherwise be blocked. Thus children are warned that the content is inappropriate, but can access it anyway if they so desire. Block - prevent children from accessing content. A wide variety of tools prevent children from accessing inappropriate content. Some, like the MS Internet Explorer, filter content based on any set of PICS labels chosen by the parent.
Some tools can block chat rooms, email, newsgroups, and other non-Web content.