To execute a remote command, the client application posts to the server a WM_DDE_EXECUTE message containing a pointer to a shared-memory object that contains a DDESTRUCT data structure and a command string, as shown in the following code fragment:

WinDdePostMsg(hwndServer,              /* Handle of server      */
              hwndClient,              /* Handle of client      */
              WM_DDE_EXECUTE,          /* Message               */
              pddeStruct,              /* Shared-memory pointer */
              DDEPM_RETRY);            /* Retry                 */