Article:		Build a Dashboard Widget
Subject:		What the 'null' means
Date:		2005-05-09 01:34:19
From:		MWright
Just in case you haven't found this reference yet, here is a description of what the the second argument in widget.system() is and what it does. (synchronous vs asynchronous mode).

Showing messages 1 through 2 of 2.

• What the 'null' means
  2005-05-09 01:39:02  MWright [View]
  
  
  Here's a better link: page.
• What the 'null' means
  2005-05-09 03:40:31  Andrew Anderson | [View]
  
  
  Thanks for the link, I too found this over the weekend. Looks like Apple posted this right after they released Tiger. It includes quite a bit of good information.
  
  Asyncrounous mode versus Synchornous mode and the ability to control System in and looks like an interesting way to wrap an interactive script or program via Dashaboard.