The networks behind these monster jackpots are the essence of modern Vegas, a city already so wired, and so primed for more, that it's become a proving ground for digital tech at the crossroads of money, profit, crime, entertainment, illusion, and delusion. Surveillance systems, more tested and proven than those used against terrorists, track and trade biometric data about cheaters, hackers, and scam artists. Software monitors and rewards customer loyalty. Equipment companies tinker with concepts like digital, networked blackjack. Billboards and signs are linked, controlled by remote overseers who immediately dispatch repair technicians whenever there's a glitch. And, by most accounts, over the next several years, Vegas' obsession with technology is only going to intensify. Odd thought: Sin City could become the most wired city on Earth, as many of the now discrete networks connect, grow, and spread via the Web.