I'm looking for general information on how dual weilding works in Diablo 2:

1. Which classes can do it?
2. What weapons/weapon types can they do it with?
3. How does it affect combat exactly?
   • Does it double your attack speed or damage?
   • Are they on their own separate attack timers or is it a chance to swing both at the sametime thing?
   • Do I have to click faster to make it work?
4. Am I better off putting a weapon with elemental damage in one hand than the other?
5. What about two weapons of different speeds?