Comment by michaelsalim

I've been building software to solve issues like this[1]. The question is always: why is it so hard to show what you want on the screen?

So I've built the system with a separate control and presentation. It connects to PowerPoint, Google slides, etc so you can present through web and control it anywhere.

I've also recently added tools to annotate slides just like described in TFA. It's still quite basic but if you're finding yourself in situations like OP, give it a try and let me know how it goes.

[1] theopenpresenter.com