I have a powerbook G4 and iforgot my password and want to update OSX

I have a Powerbook G4 and I want to upgrade my OSX but forgot the password.   I haven't used it since I bought the computer 4 years or so ago.

This article tells you how to procede without a install CD.
It works, already tested on Snow Leopard.
http://www.macyourself.com/2009/08/03/how-to-reset-your-mac-os-x-password-withou t-an-installer-disc/
Ther is also a Lion reset link updated.

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