It pains me to say this, being a Windows man, but apparently some Macbooks can display two separate images at once, one on the projector screen and another on the laptop, both full screen. You have your show on screen and your notes or whatever on the laptop screen. I don't think that can be done in Windows without dual gpu's. I am doing so that the writer reads the texts specifically written to my photos, and read it with cards and could screen laptop !!! If he went on to hide the notes before the screening would be great. And it seems to me that it can be done in the PTE, by restricting the display area?