How to recover a lost passwords?

Hi everyone,
I recently tried to help a friend in installing software she has for her Mac.
I was prompted for a password but she could not remember what her password was since she has not installed anything for a while.
I thought it was kind of careless of her not to write it down but I did not give her a speech about it.
Can anyone inform me how to recover of change passwords please?
Or a link to instruction please?
Rio.

NOTE: The following information has been publicly disclosed on a number of Internet sites, and is not a new find. I'm simply repeating it here for the sake of completeness.
Read the detailed section of this article for step-by-step instructions on regaining access to your root account.
Originally posted by QuantumFusion on the MacNN forums, and repeated with slight readbility changes, here are the steps to regain access to root:
Click Restart at the login window
While the computer is restarting, hold down "Command-S" until you see text scrolling through the window. This boots the computer into single user mode.
At the Localhost% prompt type:
/sbin/mount -uw /
/sbin/SystemStarter
You will then see various services starting up.
When the Localhost% prompt reappears, type:
passwd root
It will then ask you to type the new root password twice, so do so.
After entering the new password, type:
reboot
At the login window, enter username root wih the new password. Once you are connected, you can use the Multiple Users application (/Applications/Utilities) to change your normal user's password, or create a new user account.
Good luck.

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