From my experience, domino running as local system in windows is elevated. Like, I try to run an .exe file via a script and triggered in domino and runs without any issues (without having to specify run as admin in the script). Only in linux do you have to specify folder permissions because then it has to run as a specific user. from what i know local system user can write to any folder on the machine. anyhow you can capture folder permissions error quite easily in the agent log.