User Titles defines a hook function other modules can define. It is:

hook_user_titles($op, $uid = null)
  Use this function to describe what point scheme your module defines
  for User Titles.
  
  $op: The operation to be acted upon
    'register'
      Return module name so that module can be called later
    
    'name'
      Return pretty module name for display
    
    'description'
      Return description for module's point scheme
    
    'url'
      Fully qualified URL to module's help or admin page to be displayed.
      Usually:
        return url('admin/help/module');
    
    'get'
      Return number of points for $uid