is it possible from 6.x source in 3.3.5: install 12340?

what would be the purpose in that?

Realm wide chat, one Account for several Accounts and more functions

No, it’s not possible.

why it is not possible ?

you need client modification, client modification is not suportted here.

It’s not possible, not even with client modification, the 3.3.5a dll is packed and obfuscated.

^ To clarify a bit on that, it’s possible but not worth the effort.

Ah ok thx