Even better:
Code:
If RedirectOutput("domainusers.log",1)
   "Whoops! Cannot open the output log!" ?
   "Error "+@ERROR+": "+@SERROR ?
EndIf
   
$domain = GetObject("WinNT://"+@Domain)
For Each $object in $domain
   If $object.class = "user"
      ? $object.name
   EndIf
Next


Error return values are usually (although not always) worth checking. If you don't, they'll bite you in the bum later.