Closing MBP Without Sleep With External Display

Greetings.
I have just hooked up a Dell 23" flatscreen display to my Macbook Pro. Everything works great... connected it via the DVI cable and it worked immediately.
I'd like to be able to turn on my MBP and use the large display exclusively, meaning I want to be able to close the MBP without it sleeping. I have put my Energy Saver preferences on "Never" for the display and computer itself, but those options do not work.
What is the protocol for closing the MBP after startup so that I may use my display without the whole thing going to sleep?
Oddly, I was able to "trick" the MBP into closing at one point; I shut the clamshell, it fell asleep along with the Dell 23", then I reopened it just slightly to where it would awake again. Then I used the display for a little while and shut the MBP clamshell again and the 23 still worked while the MBP was closed. Not sure how/why it worked, and I have not been able to duplicate it.
The split screen option is neat, as far as like the MBP being on the left and the 23" being on the right, but I don't need it, and my desk is too small anyway.
How can I achieve MBP sleep while it is still powering my big display?
Thanks,
C

Ha. Welp, best $8 I ever spent.
I SWWWEEEAAARRR I tried that earlier this afternoon; also I like totally swear I looked up and down the support site too. I knew it would be easy, just not that easy.
Thanks!
C

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