The concept of data exchange DDE

DDE (Dynamic Data Exchange, Dynamic Data Exchange) is a Microsoft Windows system using shared memory between the two applications for data exchange, which is characterized by a link if the data in the application change, then this procedure database will also change, and vice versa. It functions similar to OLE, but not embedded, that is, client (Client) and the service program (Server) is a separate operation. The conversation between them through a channel (Channel) to carry out, the whole process from the control session, users do not need any interference. Although the DDE is gradually being replaced by OLE, but its application as a means of sharing data between, is still widely used and supported. In contrast, OLE server to the client through the embedding process to provide services are often slow to activate speed hate people. Therefore, in some cases can not be replaced by OLE the DDE.

Through the use of DDE, we can use the rich resources of the computer to expand the functions of MCGS, so that a variety of computer applications through DDE and MCGS way data exchange, for example, we can use Microsoft's Excel from MCGS real-time database read data, the results of the calculation of collection processing, generation of e-statements, and the results can be dealt with as a control parameter to control the production process. We also can use high-level language to develop their own applications with a DDE data exchange MCGS to realize more complex functions.