for 5 toons this gets a little more complicated ^^

i am using trinity bars 2 because my setup is going to be taking up close to 100 macros per character >.<

I'll quickly explain how it works for 5

Open up only one of your characters
as before start by placing the spell from the spell book in the keybind on your action bar.. I'll use LB again as an example in "1"

so 1 = a simpleLB

now open up the trinity bars thing and make a few hidden macros you'll need 5 per spell (ie 5 toons)

the 1st macro:
/target [target=MrA,exists]
/assist
/cast [harm,nodead] Lightning Bolt

2nd
/target [target=MrB,exists]
...

3rd
/target [target=MrC,exists]
...

4th
/target [target=MrD,exists]
...

5th
/target [target=MrE,exists]
...

then keybind them

so ur using "1" for that spell right? I suggest you bind them as follows.

1st : alt+1 (unless you already use alt+1)
2nd : ctrl+shift+1
3rd : shift+alt+1
4th : ctrl+shift+alt+1
5th : ctrl+alt+1

(replace 1 with 2 if you are moving along and do the same for different spells )

now you have to make 5 keymap files and this is where it will get a little confusing

MrA:
1 --> LBAT
ctrl+shift+1 --> LBBT
shift+alt+1 --> LBCT
ctrl+shift+alt+1 --> LBDT
ctrl+alt+1 --> LBET

MrB:
alt+1 --> LBAT
1 --> LBBT
shift+alt+1 --> LBCT
ctrl+shift+alt+1 --> LBDT
ctrl+alt+1 --> LBET

MrC:
alt+1 --> LBAT
ctrl+shift+1 --> LBBT
1 --> LBCT
ctrl+shift+alt+1 --> LBDT
ctrl+alt+1 --> LBET

MrD:
alt+1 --> LBAT
ctrl+shift+1 --> LBBT
shift+alt+1 --> LBCT
1 --> LBDT
ctrl+alt+1 --> LBET

MrE:
alt+1 --> LBAT
ctrl+shift+1 --> LBBT
shift+alt+1 --> LBCT
ctrl+shift+alt+1 --> LBDT
1 --> LBET

notice the "1" is moving down the list? (it doesn't shift them it replaces them (alt+1 stays in the same spot!). Imagine it like this.. when you press 1 under MrA, you want it to broadcast the Spell "LBAT". the others then pick that up and press the button LBAT, which for them is alt+1.. and if you look at the macro we bound that to our assist MrA macro. MrA just casts his normal spell

Now before you start.. save the trinity bars templace as.. "sham Team" or something. close the game down and go to the WoW directory and go look for the trinity bars files under WTF/<account name>/<Realm>/<Character name>/Saved Variables (i think at least).. should be 4 or 5 files named trinitybars2.lua and similar..
copy these files into your other characters WTF folders so they all have the same setup. it will copy all the macros and keybindings over to each character.

then load the keymaps to each client in the keyclone command thingy and start the game.

when you now move your mouse over to a client and start controlling him.. your other toons will automatically assist him without the need to press any other buttons..

you can do this same thing for almost any spell you like.

just remember, spells such as totems you don't need to do these sort of things for as they require no target..


oh and btw... I know.. I'm crazy!

shammies are the easiest class to macro up and I have close to 100 macros on each toon :S just wait till i get my hands on a warlock team >.<

I might make a video at some point to explain this a little further