Well, I saw what Vyn was doing with her toons on her 5 hunter team, so I was trying to do the same thing. But every time I used that type of macro, they would auto attack, and or just all targeted the same mob and then jumped it. Come to find out, I guess I have to run through all my toons and take off the default hot keys for most of the macros to work.

But yeah, I was trying to make it to where I press, lets say (1) and it sets the target to a skull, and at the same time, alt toon number 1 assists and targets it. (*so I can send my pet in to tank it*)
and then do the same for 2,3,4 so all my toons have their own mob to tank, then after that is set up, I send in the pets with CTRL1, and then have all the hunters assist my main to take out each one of the mobs at a time.