Ping in PHP: http://www.planet-source-code.com/vb...txtCodeId=1786

The Platform for Internet Content Selection (PICS) is a specification created by W3C that uses metadata to label webpages to help parents and teachers control what children and students can access on the Internet. The W3C Protocol for Web Description Resources project integrates PICS concepts with RDF.
http://vancouver-webpages.com/PICS/HOWTO.html