My point was with regard to the more sophisticated systems (though I'm not sure some the newer "simipler" systems are fundamentally different).

Anyway, as my grandfather used to admonish me: "A wise man learns something every day, until the day he dies; and, he knows that he will die a dumb man."

By the way, Mark I looked at your website. Looks like you and Michele are having fun! ;^))))

Happy Thanksgiving, Mark (and everyone else reading this).