The OM_OPCSvr.dll toolkit is a dynamic link library (DLL). Support for OPC l.0 and OPC 2 data access specification defines all necessary interface, also including the realization of the function of the browser interface. OM_OPCSvr.dll as a rapid development of the OPC server toolkit, it encapsulates all the COM and OPC technical details, hiding the technical details of the Microsoft, OLE, COM, DCOM and OPC, the OPC server development work is focused on the data acquisition task specific. Using DLL to develop OPC server developers need not consider many related to the achievement of aspects of the work to the COM interface, developers do not need to master the ATL, COM/DCOM, also do not need to understand OPC technology details, only need to have quick basic programming can be basic. Application developers can completely at a high level description of the OPC data. The toolkit supports multiple concurrent clients to access the server, and create a separate thread for each client.