MV>> String constant, where???
 TH> ie. A$ = "abc"
 MV>  Well, then it's still NOT a constant...
Yes, it is. Every expression which is not a variable (and doesn't contain 
one) is a constant.
You probably mean integer constants like:
%False = 0: %True = NOT %False
Those are constants too. It's a bit confusing...
Mark
m.bergsma.bp@net.hcc.nl
m.bergsma@dosgg.nl
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