The Development Environment OPC XML/DA You can use OPC XML/DA worksheets to communicate with OPC servers via the new OPC XML-DA protocol. TCP/IP You can use TCP/IP worksheets to configure communication between your own project and other IWS projects. The TCP/ IP Client and TCP/IP Server modules enable two or more projects to keep their databases synchronized using the TCP/IP protocol. DDE You can use DDE worksheets to communicate with other Microsoft Windows applications, such as Microsoft Excel, that support the Dynamic Data Exchange protocol. Page 47