Dual Wielding
The DUAL WIELDING skill determines if your can dual two weapons or not, many of the one handed weapons can be dual wielded, i.e. two weapons, one in each hand.

Without this skill you may only use one weapon, this skill is Profession specific and several professions get access to it.

Dual Wielding is not raisable, you only need 1pt in Dual Wielding for it to work and there is no difference between having 1pt or 5000000pts.