Well what I mean is that most sites use the just-dice.com scheme, which makes the entire sequence of players bets derived from a single seed. This means that a hacker would only need to access the seed once, and then could offline generate all games. However MP is a little bit more secure (for certain type of attacks) in that it generates a new server seed each bet, which means that someone exploiting the games would need to be continually monitoring it. Something like that, anyway.