DosQFSAttach

#define INCL_DOSFILEMGR

USHORT  rc = DosQFSAttach(DeviceName, Ordinal, FSAInfoLevel, DataBuffer,
                            DataBufferLen, 0);

PSZ              DeviceName;    /* Device name or drive letter string */
USHORT           Ordinal;       /* Ordinal of entry in name list  */
USHORT           FSAInfoLevel;  /* Type of attached FSD data required */
PBYTE            DataBuffer;    /* Returned data buffer */
PUSHORT          DataBufferLen; /* Buffer length  */
ULONG            0;             /* Reserved (must be zero)  */

USHORT           rc;            /* return code */