Am I a VMWare Guest Machine or Not?

VBScript Version

Function IsVmWareClient()
    Dim objWMIService, colBIOS, objBIOS, retval
    Set objWMIService = GetObject("winmgmts:{impersonationLevel=impersonate}!\\.\root\cimv2")
    Set colBIOS = objWMIService.ExecQuery("Select SerialNumber from Win32_BIOS")
    For each objBIOS in colBIOS
        If Left(objBIOS.SerialNumber, 6) = "VMware" Then
            retval = True
            Exit For
        End If
    Next
    IsVmWareClient = retval
End Function

' test

If IsVmWareClient() Then
    wscript.echo "yes - this is a vmware guest machine"
Else
    wscript.echo "not a vmware guest machine"
End If

KiXtart Version

Function IsVmWareClient()
    Dim $wmiService, $colBIOS, $objBIOS, $retval
    $wmiService = GetObject("winmgmts:\\.\root\CIMV2")
    $colBIOS = $wmiService.ExecQuery("select SerialNumber from Win32_BIOS") 
    For Each $objBIOS in $colBIOS
        If Left($objBIOS.SerialNumber, 6) = "VMware"
            $retval = 1
        EndIf
    Next
    $IsVmWareClient = $retval
EndFunction

; test

If IsVmWareClient()
    ? "yes - this is a vmware guest machine"
Else
    ? "not a vmware guest machine"
EndIf