Differentiating a substack from a mainstack

[Richard Gaskin]

All stacks have a mainstack property.  With a mainstack, its mainstack 
property will be its own name, so:

if the mainstack of this stack = the short name of this stack then
   put "I'm a mainStack"
else
   put "I'm a substack"
end if


--
  Richard Gaskin
  Fourth World
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