Quests

I was thinking about this the other day, and not sure what way to do it, how can I make it so theres different quests per player, like when they start them, its only for the player that starts it, like WoW, and even when they finish, they only finish for that player.

You can propably use shadow1500's Quest System: http://www.wc3campaigns.net/showthread.php?t=79324