DosFSAttach

#define INCL_DOSFILEMGR

USHORT  rc = DosFSAttach(DeviceName, FSDName, DataBuffer, DataBufferLen,
                          OpFlag, 0);

PSZ              DeviceName;    /* Device name or drive letter string */
PSZ              FSDName;       /* FSD name */
PBYTE            DataBuffer;    /* Attach argument data */
USHORT           DataBufferLen; /* Buffer length  */
USHORT           OpFlag;        /* Attach or detach */
ULONG            0;             /* Reserved (must be zero)  */

USHORT           rc;            /* return code */