David, it was an interesting question. Could you share what happened for 
you to want that feature, and how you are using it?

On a similar track - the code in the <<dumpvariables>> macro can show the 
values of all variables and macros that exist at that position in the 
widget tree. I wonder if it would it be useful for developers (or even 
users who type macros) to be able to have a way to check against that list 
to see if ANY variable that is in the widget tree is undefined, and that 
could be used to trigger a warning on any refresh and display the undefined 
macros/variables?

Regards

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