dovecot - Apr 2006 - Master Password

OK - I'm confused. Trying to use the master password feature. What do I 
need to do to generate the password? What do I do to make the 
/etc/dovecot.masterusers file? thanks in advance. When I get this to 
work I will update the Wiki so that someone like me can understand it.

auth_master_user_separator=*

  passdb passwd-file {
    # Master users that can log in as anyone
    args = /etc/dovecot.masterusers
    master = yes
    #pass =yes
  }