ExceptionHandler (_ERR *)
This field must be treated as a C-language volatile field. That is, even though this field may be changed in ways unknown to your program, the intent of the original expression will be maintained.
The ERR function is defined below:
typedef ULONG APIENTRY _ERR (PEXECPTIONREPORTRECORD,
struct _EXCEPTIONREGISTRATIONRECORD *,
PCONTEXTRECORD,
PVOID);
typedef _ERR *ERR;