I have no second monitor or dummy plugs. Is there any other way to do this?

Hey everyone, I'm new to bitcoin mining and I am trying to setup my computer for it.
I currently have 2 5850's and an i5 750.
I am running poclbm with these settings:
I tried launching another instance using thte -d2 command but it says that there are only 2 devices, my i7 and my first 5850. I am averaging at about 243000 khash/s on my single card. How do I get both working properly?
I have crossfire off.