pretty sure ePO events contain hostnames, which you can potentially use in a correlation rule. Or IP address range, if your servers and PCs are not on the same vlan.
Thanks for the reply. I had thought about IP ranges utilized in zones after posted this and left yesterday. I think i'm going to give that a try. That seems to be the simplest route as we're pretty strict on what kind of systems go on the Server and Workstation vlans.