sentences:  A droplet can also be launched the same way as an ordinary applet, executing its run handler.on idle
  end idle
  
  An idle handler can be used in applets or droplets saved as stay-open applets, and is useful for scripts that watch for particular data or events.The length of the idle time is 30 seconds by default, but can be changed by including a 'return x' statement at the end of the subroutine, where x is the number of seconds the system should wait before running the handler again.