How to properly disconnect Air from an external digital projector

Hi, I plugged my new Macbook Air into the digital projector at a client site via the Mini DisplayPort to VGA Adapter I bought at the Apple Store. I was able to project the contents of my screen, but I wasn't sure how to disconnect properly. When I unplugged the adapter, my computer seemed to freeze, shutting me out of all open programs until I did cold re-start.
What should I do next time to get a better result?
Thank you!
-Mike

I've always shut down the projector, and the computer reacts by reverting to single built-in monitor mode. Then I diconnect the cable.

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