How does client tell betwen 1h and 2h weapons?

[ChaosSlayer]

God i hope this is right forum for such questions, since nothing realy fits the category directly.

anyway, how does client/server EXACTLY knows what type of weapon you using?

First i thought this was assigned skill based.
For exmaple:

2handed sword uses 2HS skill. even if you assing Secondary slot to the item you still need both hands free to hold it.
So this is simple.

HOWEVER, when it come to Piercing... there is no such thing as 2HP!
And as we know those spears and daggers come both as 1h and 2h, and they both have same skill assigned to them... so how does it work so client/server KNOWS that this specific spear is 2handed?

thanks =)