Calibrated screen?

I use Eye-one Display 2 in a dual monitor set-up, but it will only calibrate one screen, but I was informed about this before purchase.

sfuny I nearly bought one of thems , it was in a list I was sent in response to a query about products to calibrated two screens.I assumed that was the difference between a version 2 and non 2 model.
At the time I wrongly assumed that the software on a single unit tied it to specific computer [like later versions of windows]
My Huey- Pro is supposed to handle two screens but even with two hooked up I can't see any thing in the software that indicates a screen choice?
Alistair