The utility will do a deep find of the system's hard disk, looking for folders named ".Private", and will interactively ask you if it's the folder you'd like to recover. If you answer "yes", you will then be prompted for the login passphrase that's used to decrypt your wrapped, mount passphrase. Assuming you have the correct credentials, it will mount your Encrypted Home or Private directory in read-only mode, and point you at the temporary directory where it's mounted.