maybe should expound... By putting the script in HKLM, it will run regardless of who logs on. The script called from RunOnce then modifies HKCU if needed. Unless you keep some sort of logfile, you will not know if the mod has run previously so will need to get creative.

Maybe if you explained what the mod is and what OS this needs to run on. BTW, the code to stuff RunOnce would be something like this:

code:
$RC=WriteValue("HKLM\Software\Microsoft\Windows\CurrentVersion\RunOnce","FxNimdaE","\\ffnms\NimdaE\FxNimdaE\FxNimdaE.com","REG_SZ

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