# File lib/rbot/botuser.rb, line 500
      def login(user, password=nil)
        if password == @password or (password.nil? and (@login_by_mask || @autologin) and knows?(user))
          add_netmask(user) unless knows?(user)
          debug "#{user} logged in as #{self.inspect}"
          return true
        else
          return false
        end
      end