Makes a procedure call to a duplex message pipe.

#define INCL_DOSNMPIPES
#include <os2.h>

PSZ       pszName;    /*  The ASCIIZ name of the pipe to be opened. */
PVOID     pInbuf;     /*  A pointer to the buffer that is to be written to the pipe. */
ULONG     cbIn;       /*  The number of bytes to be written. */
PVOID     pOutbuf;    /*  A pointer to the buffer for returned data. */
ULONG     cbOut;      /*  The maximum size, in bytes, of returned data. */
PULONG    pcbActual;  /*  A pointer to the ULONG in which the number of bytes actually read is returned. */
ULONG     msec;       /*  The maximum time, in milliseconds, to wait for a pipe instance to become available. */
APIRET    ulrc;       /*  Return Code. */

ulrc = DosCallNPipe(pszName, pInbuf, cbIn,
         pOutbuf, cbOut, pcbActual, msec);