Simple sanity check:

$=Execute("Exit 0")
"Exiting with '0' gives status "+@ERROR+": "+@SERROR+@CRLF
$=Execute("Exit 1")
"Exiting with '1' gives status "+@ERROR+": "+@SERROR+@CRLF


Results in:
Exiting with '0' gives status 0: The operation completed successfully.
Exiting with '1' gives status 1: Incorrect function.