ROTMG Multiboxing.

Hey guys.
I wanted to multibox in rotgmg but I'd like the opinion of you
in what program I should use.

I have the modded client that TazWuzHereLowlz posted a week ago and I run it through steam.
Also I saw a video with ISBoxer and it seems pretty good.

So my question is.
Can I multibox 4-5 accounts and at least one running on steam or all should be on steam?
Also if I can't do it with steam can I multibox with the specific modded client I have?

Thanks in advance.

Yeah I saw a bit later that you have to pay for isboxer.

Thanks for the fast reply, I will check the MB you said.

EDIT:
Tried finding the Krazyshank's Realm program but it gave me results for private servers.
Did I search something wrong?

Thanks both of you.
Trollaux the one you said isn't working good, it overloads my cpu and can't even run 3 windows.
Also key broadcast isn't working.

Zbornox the one you said works pretty nice, found it myself yesterday but didn't check it much.
Thanks though.

It's boring