Zend questions (debugging, mail list)

// If this is the wrong list, could someone redirect me to the correct one? // I noticed at the zend web site (http://www.zend.com/) that one of the new features in the zend engine is "A full-featured debugger has been integrated with the language (supports breakpoints, expression evaluation, step-in/over, function call backtrace, and more)." I searched everywhere on the php site, zend site, and a little but in the php4b2 source code, but didn't see any more about it. Question #1: Does anyone know if it exists, and if so, how does one use it? Question #2: Does anyone know if there is a zend mail list? Thanks -Jon