User`s guide

28 • OPC Client Sample Program
Step 10.If you want to build a connection between server and client,
click the Advise button. It advises the NuDAQ PCI card OPC
server of client’s IOPCDataCallback interface. After that, once
item values change, the NuDAQ PCI card OPC server will
invoke OnDataChange() to notify the client. The changed
values will be presented in the Items in Current Group list.