[Santtu]

I've tested all the one-class groups (all warlock, all mage, all rogue, etc) and it's relatively easy. At the easiest level there's one leader who sets up targets, with tab, or by clicking manually. Other accounts are set up to target whatever the leader is targeting. So, they have a lot of macros set up like ..

/target party1target
/cast fireball

and such.

They also have a macro

/follow party1

Which makes them follow the leader.

All of this requires a software to duplicate keypresses to all the accounts. I use keyclone, which is set up on all the computers with WoW game instances I run. For example, when I press 1, everyone attacks the monster my leader is targeting with their best spell.

At a much more advanced level, I use a home-made script running on Windows to distribute key bindings and macros to multiple computers on my small network. I can use even 5 different classes on a same party. I just assign certain kinds of spells to the same keypress, and make them all do the action at once. For example, if key 2 is a damage spell button, I make the priest do shadow word:pain, the shaman do lightning bolt, etc. If the key 3 is the heal, I make each of the healer classes do their heal.

Sometimes I have to make the different classes do their thing on a rotating basis. Then a spellsequence macro comes handy; I make my 2 healers do a sequence of 2 of heals, one of them doing a sequence of (nothing, healing wave) and another do a sequence of (flash heal, nothing). This has to be set up in both the key duplicating software and the macros of the individual characters.