On my Pally's screen, you can see dummy icons I made up for the Shaman's LB and the Warlock's Shadow Bolt. Those macros are placeholder and you don't even need buttons. They are there to let me know that I am clicking on them. HKN listens for the location of the click, maps it to a keystroke and sends it through to the other window. Works well. I am a pretty bad multiboxer, but getting better. The system works as well as if you were soloing.