Software Toolbox Data Collection Engines One of the most important parts of the Software Toolbox Extender are the Engines. These interface the Extender with third-party data acquisition products. Engines are included with the Extender package, with the one you get depending upon your requirements. SWToolboxOPCDataControl - Collects data from OPC Servers (Default Engine supplied with the Extender) Underlying Component: OPC Data Control (ActiveX) SWToolboxOPCDataNET - Collects data from OPC Servers Underlying Component: OPC Data .NET Component (.NET) Connects to any OPC-DA compliant server. You may choose between the engine that features the OPC Data Control (http://www.opcactivex.com) or the OPC Web Client (http://www.opcdata.net).