Macbook Air set firmware password?

Hi,
I need to set a firmware password (EFI) for my Macbook Air Mid-2011.
Problem is that all articles I found here talk about resetting the password, which I don't care.
How do I actually set the password? There is no doc for Intel-based machines.
Is there a utility? Installed by default?
Any procedure clearly described somewhere?
Thanks for any help.
Steve

To set up firmware password in the Mid 2011 MacBook, you can use OS X Recovery > http://support.apple.com/kb/HT4718
To start in OS X Recovery, hold Command and R keys while your computer is starting. Then, after starting in Recovery, go to Utilities menu (on the menu bar) > Firmware Password Utility, and follow the steps

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Macbook Air set firmware password?

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