title: Google Wave Robot - Change to Wave in response to an external event
body: <p>I am writing a Google Wave Robot that allows users to "manage a wave". I plan to have a configuration page on my website. When the configuration is changed, ideally all waves where this user added by this user should change immediately (or at least next time someone views the wave). What is the best way of doing this?</p>
  
  <p>Apparently, "a robot cannot contact Wave directly; it can only respond to wave-related events and cron events". If I decide to go the cron route, how quickly can I update the Wave?</p>