send key press to remote computer

I'm a pastor and when I preach I use my touchscreen laptop to read my sermon. I would like to be able to touch, say a picture of the slide, and have it advance the slideshow on a remote computer. I've looked everywhere for a way to send a keystroke via VBA from my computer over the network to the presentation computer. The presentation software uses f9 and f10 to advance backward or forward.
I don't want to see the remote computer screen or have to do any other interacting with it, just send the keystroke (just like a presentation remote). Thanks so much.