The Cogent DataHub can act as both an OPC A&E server and client program at the same time. This means it can read from multiple OPC A&E servers (while acting as a client) and make this data available to any number of OPC A&E client programs (while acting as a server).
Note: the DataHub cannot be configured to act as a source for generating alarms and events, but if it is configured as an OPC A&E client, it can pass along A&E values. This is useful for tunnelling A&E data, converting A&E data to OPC DA or OPC UA data, and allowing OPC DA or UA clients to interact with and display data from OPC A&E servers. Automatic A&E ↔ OPC DA and A&E ↔ OPC UA protocol conversions are built-in.