I want Macbook on when I close display.

I used to be able to have a choice of settings when I had my Sony Vaio. You had the option to select these actions when you closed the display, 1)Shut Down,,2)Sleep,,,,3)Stay On.
This was cool , because I could have a program running and processing something or rendering something while I was transporting it in my backpack. Or downloading something. Or whatever.
Is there any way to customize the settings on the Macbook so one could do this? I need it to stay on while the display is closed. While I am temporarily moving from one place to another. All the programs stop when the Macbook goes into sleep mode.
Thanks , -Scott

Scott,
You may have a problem trying to do this because of the SMS aka Sudden Motion Sensor built into the MacBook. This explains it. http://en.wikipedia.org/wiki/SuddenMotionSensor
As tele-player stated it is also not a good idea to carry it like this because of the possibility of the heads crashing. And of course the heat build up. There are just to many factors that might defeat the purpose of wanting to keep it running while it's closed.

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