Two Video Outputs

Hi, I need your help.

I need to run a program at my church. The program requires two video outputs, one to view a control panel type screen and the other to "push" video to projectors. The software allows a person to create and control a video presentation on the fly. The audience only sees the video being pushed through the second video output, not the control panel being used to adjust/create the presentation. In short, are the imacs expandable to two video cards with out puts? I assume the Mac Pro is expandable but are any other desktops?

Thanks,
Dave

I'm interested in this also. Our church currently uses a Dell laptop for this purpose, but I would love to switch to a Mac. What are the options for an iMac with dual outputs?

You Can Use: Live Worship

http://www.liveworship.com/downloads/index.html