Natty live cd and orca

[Milton]

Hi,
How can I try the live cd with Orca?
After I started up the pc with the live cd, I press the spacebar and select a language (with the help of a sighted person).
Pressing F5, 3 and twice the enter key, after a while the desktop appears.
How can I start Orca or is it not possible?
Milton
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