This structure contains fields for the SMH_REPORTEVENT message.
typedef struct _PARM_EVENT {
ULONG ulFunction; /* SMH command function. */
HID hid; /* Handler ID. */
HEVENT hevent; /* Explicit events only. */
PEVCB pevcbEvent; /* Event status and HSTREAM. */
} PARM_EVENT;
typedef PARM _ EVENT FAR * PPARM _ EVENT ;