Where can I download Apple Hardware Diagnostics for my MacBook Pro ?

I have a problem of Mac freezing with an alarm sound forcing me to shut down, and someone suggests that I run an Apple Hardware Test. But I have no such CD. Do you know wether such an application can be downloaded for a MacBook Pro (Mac Os X Lion) ?
Thanks in advance for your answer.

Thank you very much !
I was surprised not to have a CD for AHT. But if it is already included in the MacBook, it's fine.

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Sean and Andy -
I have to agree with Andy here. I am having the same problem on a mid 2010 MBP (6,2). I have already read the AHT info provided by Sean's link, and they are less than helpful. I'm sure they will be helpful to those who find that they work, but they are confusing if this is not the case. For example, my MBP(6,2) came with ONE (not two) installation disks, so the instructions don't work for me. Another issue is the instructions confound the descriptions related to the MBP, the original (delivered) software (OS X version), and the current installed OS X upgrade software.
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