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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