Thanks to both of you.
404NotFound - that is extremely kind of you, I hope my progress (in this area) will be of use to you too soon, thank you.
OK, so far we agree (I think) that we can return a code to a function but we don't know how to determine that functions returned code from another program.
There should be a way to define this (return code) as some sort of 'program variable' (sorry - my terminology is currently lacking) such that, should another program run the program, it can determine it's return code (if that code !=0).
Thanks for all the generous help so far! (I love this place)
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REAPER? Oh yes...
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