The general idea is that of the minimap.
On one screen, you could have your regular fps style. View of the teeth/gun. On the other, you could have the minimap(expanded).
This way you could keep track of whats going on without blinding yourself with the minimap and keep a watchful eye.
I was thinking that commanders could have two command screens, instead of one. Both screens would serve the same purpose as the original overhead command, and it would allow multitasking on the battlefield. The com could reserch things in base, then he moves his mouse over to the other screen, and drops some meds or other items for the team.
Although it needs refining, I would think that it would be useful.