MacBook - stop going to sleep mode When lid closed

Hi ,
I am using handbrake to convert video files on macbook .
I want to close the laptop lid and still want the process to run in background .
Some one mentioned that if the laptop lid is closed and the system is running it gets heated rapidly .
I want to do this for 45 minutes ( commute between office and home ).
So , how do I close the lid ( display ) and not allow the system to go to standby/sleep.
Thanks
macbook   Mac OS X (10.4.9)  

You could also use InsomniaX.
I do not think that it's that bad for your macbook (heat generation); see this article: How to use your PowerBook G4, MacBook Pro or MacBook with the display closed.
I would not recommend picking your notebook up, though, since the hard disk's heads could scratch your hard disk... That's one of the things standby prevents.
By the way; why wouldn't you use standby? Your mac goes in standby rapidly, and wakes up even faster!

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