Display current slide on projector when laptop is locked.
I'm presenting a security deck. It's time for a quick break. I'd like to leave my last slide showing on the projector - but after what I've taught the class already, I am not going to trust them to leave my laptop unmolested. It would be nice if I could lock the laptop AND see the last slide on the projector, so I can unlock and pick up where I left off. Currently, when I lock the laptop, the secondary display gets a black screen.
Why don't you use the beamer's Freeze button?