This function posts a message to the other application involved in the direct manipulation operation.
#define INCL_WINSTDDRAG
#include <os2.h>
HWND hwnd; /* Window handle to which the message is to be posted. */
ULONG msg; /* Identifier of the message to be posted. */
PDRAGTRANSFER pdxfer; /* Pointer to the DRAGTRANSFER structure. */
ULONG fl; /* Flags to be passed in the param2 parameter of the message identified by msg. */
ULONG ulRsvd; /* Reserved value, must be 0. */
BOOL fRetry; /* Retry indicator. */
BOOL rc; /* Success indicator. */
rc = DrgPostTransferMsg(hwnd, msg, pdxfer,
fl, ulRsvd, fRetry);