What is the use of Dual Client of Dragon Nest ?

ahaha,, anu nga ba?
im a noob as well,,
and im thinking,, itz for farming,,,(tho i dont know hw to frm yet)
for boosting (but its hard to control 2 characters / windows at once, and risky to use tele hacks on a party)
multi client rc farming,
aside from that,,,
,,is that it???