QuickOPC is not just an OPC API. QuickOPC options provide a way to reach far beyond the traditional level of OPC toolkits.
The Excel Option for QuickOPC allows you to set up a communication link between Excel and any OPC server. It is possible to subscribe to and view real-time data, and also write the data back. No programming, macros or add-ins are necessary. With just drag-and-drop or copy-and-paste, you can create Microsoft Excel sheets with live, animated OPC data.
Useful links: Documentation / Knowledge Base
Footnote & required disclosure: QuickOPC (including its Options) is a software development kit (SDK) for development of OPC clients. Installing QuickOPC or its Options does not change system settings.