Running macbook pro with lid closed

Hi all,
I want to run the Macbook Pro with the lid closed, like maybe when I'm downloading a file or using it as a desktop with an external screen.
I have insomniaX, however I am concerned about heat.
The vent in the back seems to put out as much air as it does with the lip opened.
Any insight on this?
tia
edit: oh yea I have an early '09 mac book pro; 15" if it matters
Message was edited by: große geld

If you use InsomniaX, you should certainly be concerned about heat. I recommend trashing InsomniaX, because it enables you to abuse your MBP in a way that Apple intended to make impossible.
To use the machine with its display closed as it was designed to be used, follow the instructions in this article:
http://support.apple.com/kb/HT3131

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