Progress
External Program
Interfaces


Windows Dynamic Data Exchange

Dynamic data exchange (DDE) is a general protocol for inter-process communication in Windows. This protocol allows any two Windows applications to communicate as client and server, where the client initiates communications with the server and the server provides data and services to the client.

Progress supports DDE communications acting as a DDE client only. Using 4GL DDE statements, your Progress application can initiate and maintain communications with any other Windows application with DDE server capability. This communications includes exchanging data with the server and directing the server to execute server-defined commands. Your Progress application can communicate with different server applications during a session, and can even access entirely new server applications without modifying your existing Progress code.

The following sections describe how to use DDE in your Progress applications. For more information on DDE concepts and facilities, see the Windows programming documentation on DDE.

This chapter contains the following sections:


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