If you use an Nvidia Video Card you should have an application called "nView Desktop manager". Open that (from Control panel), hit 'Enable', go to the 'Applications' Tab, hit 'Add', find the 'aceshigh.exe', then OK, then 'Individual settings' then select 'Open Windows on select display': then choose the display you want. That should be how, but I haven't messed with it in a long time.