Removing external display, what is right way to wake up the internal?

I tried connecting to an external display (an HP L1955) via a DVI cable, closed the MBP, and was able to get the HP display working at its native 1280 x 1024. But then I wanted to go back to the internal display, so I disconnected the cable, but then found I couldn't wake the MBP. I hit the F7 a couple of times, moused down a couple of times, and finally it woke, but what's the correct procedure to go back to the internal display.
I guess it's different when running mirrored or extended, that is, using both displays -- I presume I just disconnect it and all is fine. (question though is what happens to windows on the extended display if I disconnect it -- are they off screen and not retrievable?)
Also, one nice thing about this display is that it has both VGA and DVI inputs, and their independent. I have a winbox connected via VGA, and I can switch between the inputs with a push of a button. Kinda cool to see that happen...

To use your MacBook with an external monitor with the MacBook display closed, you need to connect a USB keyboard and mouse. The User's Guide recommends turning on the external display first before connecting to the MBP, then it will automatically detect the display. Pressing F7 switches between mirroring or full-screen mode. After putting the MBP to sleep by closing the lid, wait a few seconds before pressing a key on the external keyboard to wake the MBP and use the external display.
I do not have my MacBook Pro yet and I don't use an external display (tried it before just playing around). I would wake the Mac before disconnecting the external display though.

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Mac OS X Help
http://www.apple.com/support/macbasics/
Isolating Issues in Mac OS
http://support.apple.com/kb/TS1388
https://www.apple.com/support/osx/
https://www.apple.com/support/quickassist/
http://www.apple.com/support/mac101/help/
http://www.apple.com/support/mac101/tour/
Get Help with your Product
http://docs.info.apple.com/article.html?artnum=304725
Apple Mac App Store
https://discussions.apple.com/community/mac_app_store/using_mac_apple_store
How to Buy Mac OS X Mountain Lion/Lion
http://www.apple.com/osx/how-to-upgrade/
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Removing external display, what is right way to wake up the internal?

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