Two women deal cards in the air and throw dice that float, matching bets placed by gamblers on electronic games. None of it is real, except the money on the bets. The holographic dealers are among the more advanced technology being shown for a select group of people this week at the Global Gaming Expo in Las Vegas. Getting past the security and velvet ropes to view the demonstration is much like trying to get into the Marquee Nightclub on a busy weekend night.