It is very cool to share screens!
The card I was taught with told me how to make an image of my iPad screen (Press the power and the man button at the same time). I like how it makes the camera click noise to tell me it was shared. I found the image in my Fotos app, and even figured out how to upload it to Google Drive.
I think this can be useful as a way for students to show my work they did (if in the case they have the iPad device, maybe my department can get a shred one?) I can also use it to provide visual explanations.