I use Clonedkeys. My only problems with the broadcasting software are that if you spam too much it gets behind on the other windows. You really need to be able to relax and just hit a DPS key at a time, a heal key, a DPS, etc. Spamming a lot is bad news.

I have two widescreen monitors and each will display one tank as a large center window with one smaller window in each corner that I click on to immediately control the followers. I can only see a sliver of the windows in the back at any time, but I can control any of my characters within a mouse click. I can start the bombing run quests by clicking through the windows quickly enough to get credit all at once, for example. I wonder if this works well on Windows! I wouldn't know anything about Windows.