Re: How robust is INCLUDE

I don't think I quite understand what you're trying to achieve.
But what happens if there are errors in the process?
Leftover garbage on the s-stack?
At least in my system(s), INCLUDED is implemented with an
internal CATCH/THROW mechanism, which clears all important
stacks (and some internal stuff) on error.
As for ANS compatibility: who cares, as long as your code
is well documented.