This issue seems to come up frequently enough to deserve a page
of tips, suggestions, warnings, etc.


The basic situation is that a user is trying, either intentionally or 
accidentally, to do ''pointer'' like design.

So they end up discovering they need to do something like:


 set a "123"
 set b "3.1415"
 set c "The price of petrol in Peroria"

 foreach var a b c {
   puts [set $var]
 }

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