We have a complete stickied guide on the subject of linking accounts.
How to link accounts
Personally, the fact you have to turn graphics all the way down on the game just kills it for me. The games graphics are cartoonish to begin with.
I... use two computers instead, and I can control them both at the same time. That is simultaneously, without changing windows.
Ill add the thread killing trick to run both on same machine to my linking guide though, some will obviously want to do that.
Ironhawk, may I use your task manager image?