Another thing I thought of while doing it at work is quite the opposite of Remote Desktop in this sense. Set up VNC Viewer on the kiosk computer, and set up VNC server on a box you have physical control over. Simply modify the PPT on the Server machine and voila, the screencaptures sent to the Viewer are correct. There might be a few issues with color/capture rate, but you can tweak those..
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"I'm typing on a computer of science, which is being sent by science wires to a little science server where you can access it. I'm not typing on a computer of philosophy or religion or whatever other thing you think can be used to understand the universe because they're a poor substitute in the role of understanding the universe which exists independent from ourselves." - Willravel
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