How do modal dialog stacks interfere with main stack?

[MultiCopy Rotterdam-Zuid]

I was trying to figure out how a modal dialog stack interferes with the main
stack, so I looked it up in the documentation (Transcript dict.:
dialogData). There was the advise to take a look at te license.rev stack,
but the script of that (main)stack is password-protected. So I still don't
know. Any suggestions?

Terry 
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