Output / Multiple Monitor from MacBook Pro

I have a question. I am working with live video production and we want to have our presentation (similar to PowerPoint but a professional live presentation software) sent to two different monitors. The monitor is being sent via thunderbolt then via HDMI out to a projector, but here is the difficulty, we also want to send the same image to a second MacBook Pro which is running our live video switching software, so that we can mix our original presentation into the live video stream when necessary. Does anyone have an idea how we can get the presentation from the first computer onto the second computer? It should be the full-screen image exactly matching that from the projector. One more comment, I am not sure if a simple HDMI splitter will work because maybe the second MacBook Pro won't recognize the input as a monitor. Thanks so much.

Activate Screen Sharing on the computer that's giving the presentation and connect to it from the other computer. You will have to use the projector in mirror mode. The presentation software should be running in full-screen mode.
OS X Yosemite: Screen sharing overview
OS X Yosemite: mirroring

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Output / Multiple Monitor from MacBook Pro

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