Q: Dmg Calculations?

[Darguth]

Couple of damage related questions because the Wiki is unclear or missing, in case anyone should know.

1.) How does 2H weapon damage calculations differ on P99 than single-handed weapons? Both for mainhand dmg bonus and any other differences?

2.) When determining a comparative dmg calculation (i.e. assuming all things being equal except the weapons) for dual wielding vs. 2H would you just add together the damage bonuses of the two dual-wielded weapons or something else to determine their output?