I play on a Mac so I had to come up with a lot of work arounds as its not natively a part of the apple OS but essentially putting your mouse over the window will bring it to the front. Its called Focus-Follows-Mouse or something like that in windows.
Basically this allows you to do mouse circles across the windows to allow you to put a key press to that window. There's quite a few good YouTube videos on peoples set ups, look for 'multi boxing manually'. There's a very slight delay on the Mac OS work around I use which I haven't seen so much in Windows set ups but its useable. I was manually clicking on each warcraft window to bring it to the front, which is why I started manual boxing in TBC with hunters so they could at least sustain some dps even without button presses through auto shot and pet damage.
Its no where near as efficient as broadcasting, I would say at best I'm probably getting 65-70% dps efficiency on my characters but that seems to be enough to do heroics. Gearing in wrath definitely trivializes a lot of the content.
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