This structure contains fields for the SHC_START message.
typedef struct _PARM_START {
  ULONG       ulFunction;  /*  Handler command function. */
  HID         hid;         /*  Handler ID. */
  HSTREAM     hstream;     /*  Handle of stream instance. */
  ULONG       ulFlags;     /*  Start flag. */
} PARM_START;
typedef   PARM _ START   FAR   * PPARM _ START ;