How to dual box on lineage2?

Hi everyone, im playing l2 for 4 years now, and i went to a server where dual box is legal. So i want to take part of the situation.
But it happens that i dont know a single thing about the subject of dual boxing.
All i can do is pressing alt + tab all the time.
I wonder if u could give me a hand with this.
All i wanted is to be able to control the both clients from 1 client, by pressing some key.
I mean if i press "Y" i get "X" on the other client.

Ty and sry for bothering, im really lost :p

Check the wiki or the Software section for broadcasting keystrokes which is basically what your looking for, many programs do this for more than 1 client on the same pc :) i.e. Keyclone / Octopus / Hotkeynet / Autohotkey

Yea thx ^^

But i am looking now for a newbie tutorial cause i think im not doing the things right.