ok WinNT test passes as well:
 Code:
Dim $objGroup
$objGroup = GetObject("WinNT://"+@LDOMAIN+"/Domain Admins")
$objGroup.GetInfo
If $objGroup.IsMember("WinNT://"+@LDOMAIN+"/"+@USERID) = -1
  ? "Global Test Succeeded"
Else
  ? "Global Test Failed"
EndIf