This function is issued by a server application to indicate that it can support a dynamic data exchange conversation on a particular topic with a national language conversation context.

#define INCL_WINDDE /* Or use INCL_WIN, INCL_PM, */
#include <os2.h>

HWND            hwndClient;    /*  Client's window handle. */
HWND            hwndServer;    /*  Server's window handle. */
PSZ             pszAppName;    /*  Application name. */
PSZ             pszTopicName;  /*  Topic name. */
PCONVCONTEXT    pContext;      /*  Conversation context. */
MRESULT         mresReply;     /*  Message return data. */

mresReply = WinDdeRespond(hwndClient, hwndServer,
              pszAppName, pszTopicName, pContext);