For example, using DDE your program can populate cells in an Excel spreadsheet or retrieve data from the spreadsheet. The demonstration is written for synchronous communication however it can easily be changed for asynchronous. Developed By This application was developed by Eric D. Wilson. The client can send commands and data to the server which will run the commands and process the data. This exchange of messages is called a conversation .
Conversations are about a topic .
Think of a topic as the fundamental data grouping used in an application. A workbook in Excel or a form in VB for instance. Topics can be about a specific item , say a particular Excel spreadsheet cell. Lets look at an example of sending data to a cell in Excel. This is accomplished with a call to the DdeInitialize API when you click the Initialize button.