sentences:  Handlers can also be defined using "to" in place of "on" and can be written to accept labeled parameters, not enclosed in parens.There are four types of predefined handlers in AppleScript—run, open, idle, and quit—each of which is created in the same way as the run handler shown above.on open theItems
  end open
  
  When a script containing an "open handler' is saved as an applet, the applet becomes a droplet.