I started boxing by just opening multiple instances of the EQ client, it ran 2 fine, but when I brought a 3rd into it, everything got really choppy and unplayable.
I now use wineq2, it will run 3 instances fine, if i bring a 4th in, its playable, but a little choppy, I could probably fix this by adding more RAM, because the usage is up past 90% with 4 going.
The great thing about wineq2 is that you can customize the window names so when alt tabbing, you can actually see which window your bringing to the front. Or leave the task bar up at the bottom of the screen and just click when feeling lazy