Quote Originally Posted by Googolplex View Post
I am more interested in the long answer
It doesn't get much longer:

1) Use a key multiplexer software to send keys 1-9 to both windows.
2) Put DPS spells on actionbar1-5 on the dps character and nothing in spots 6-9
3) Put heal spells (or more likely targeted healing macros) on actionbar6-9 of the healing character and nothing in spots 1-5
4) play