Once an OPC client transaction has been authenticated, DCOM security must determine if that OPC client is authorized to perform call-level interactions with the OPC server. (COM/DCOM technology allows OPC client applications to make programmatic calls across process and computer node boundaries.) This determination is made by looking at the ACL (access control list) for the OPC server COM object. This ACL (or list of users and/ or user groups) for the OPC server is configured using the DCOMCNFG utility supplied with the Windows operation system.
If the OPC client's user identity is listed on the OPC server's access permissions ACL (as a user or group member), then the OPC client can access GagePort Mitutoyo OPC Server objects.
About DCOM security.