I dont get this to work.
I have done like this:

Dim $iRC
$iRC=SetOption('Explicit','On')
$iRC=SetOption('NoVarsInStrings','On')
$Domain = "MYDomain"
Dim $Computer,$Group,$User
$Computer = "ws001"
$Group = GetObject("WinNT://" + $Computer + "/LGrp,group")
** I changed the following line: **
; $User = GetObject("WinNT://" + $Computer + "/dave,user")
to the following because it is Domain Users I am looking for:
$User = GetObject("LDAP://CN=Domain Users,CN=Users,DC=intra,DC=se")

then I dont understand how I will get this into the local SAM. I tried this:
$Group.Add($User.ADsPath)
but it wont work.

Howard your reply was :
$Group.Add("WinNT://$Domain/Domain Users")

but that wont work.

/Mima