$numberOfSubscribers = 0
$instanceID = "Intel(r) AMT:All" # The instance ID of of the desired filter.
$filterCollectionRef = $wsmanConnectionObject.NewReference("SELECT * FROM CIM_FilterCollection WHERE InstanceID='" + $instanceID + "'")
$filterCollectionSubscriptionRef = $wsmanConnectionObject.NewReference("CIM_FilterCollectionSubscription")
$filterCollectionSubscriptionRef.AddSelector("Filter",$filterCollectionRef)
foreach($filterCollectionSubscriptionItem in $filterCollectionSubscriptionRef.Enumerate("http://schemas.dmtf.org/wbem/wsman/1/wsman/SelectorFilter",$null))
{
	$numberOfSubscribers++
}