I am currently teaching the Compilers course remotely. Because of the interaction and material (drawing tables, DFAs, NFAs, regexps, etc.) I wanted to present some kind of whiteboarding and Powerpoint slides, and draw over the slides.
Since the class meets remotely, I am connected through Skype to the class, and need to share what's on my screen, but also add some white slides to use as whiteboard. I've found a couple of different ways to do it:
1) Using Powerpoint for iOS to display the presentation and a Macbook for main screen. This is by far the best method, as the iPad Pro palm detection mechanism works beautifully here. I then mirror the iPad's screen to the computer, and then share it out of the call. To mirror the iPad screen, I use QuickTime.
2) Using Duet Pro for iOS, this essentially converts the iPad to something like a Cintiq tablet. Mac OS does not include any Ink support, so Powerpoint does not work adequately with the iPad. So this works best as a Windows setup. However, gesture detection gets in the way, palm detection is not very good and makes me advance to the next slide when I'm writing on top of a slide, so that gets annoying.
I'll keep trying, and maybe Duet Pro gets better on new releases, as I'll be using a Windows computer for the most part of the course.