How to detect that user closed window

[Richard Gaskin]

Bob Sneidar wrote:

 > filename does not seem to be a property of a stack.

The filename is a property of mainstacks.  For substacks use "the 
effective filename".

For stacks that have been newly created, or downloaded over the Web, the 
filename will be empty.

-- 
  Richard Gaskin
  Fourth World Systems
  Software Design and Development for the Desktop, Mobile, and the Web
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