Isolate a file name unique to the custom image and create a custom rule-type of File which matches on the file. Select the Required option under the custom rule.
Identify the MAC address unique to network cards installed in PCs with the custom image and create a custom rule-type of MAC Address which matches on the appropriate MAC address.
Select the Required option under the custom rule Identify the IP address unique to the network cards installed in PCs with the custom image and create a custom rule-type of IP Address which matches on the appropriate IP address. Select the Required option under the custom rule.
Isolate or create a unique Windows registry key for the custom image and create a custom rule- type of Registry Setting which matches on the name of the registry key.