typedef struct _OBJECT_TYPE_INITIALIZER
{
     WORD Length;
     UCHAR ObjectTypeFlags;
     ULONG CaseInsensitive: 1;
     ULONG UnnamedObjectsOnly: 1;
     ULONG UseDefaultObject: 1;
     ULONG SecurityRequired: 1;
     ULONG MaintainHandleCount: 1;
     ULONG MaintainTypeList: 1;
     ULONG ObjectTypeCode;
     ULONG InvalidAttributes;
     GENERIC_MAPPING GenericMapping;
     ULONG ValidAccessMask;
     POOL_TYPE PoolType;
     ULONG DefaultPagedPoolCharge;
     ULONG DefaultNonPagedPoolCharge;
     PVOID DumpProcedure;
     LONG * OpenProcedure;
     PVOID CloseProcedure;
     PVOID DeleteProcedure;
     LONG * ParseProcedure;
     LONG * SecurityProcedure;
     LONG * QueryNameProcedure;
     UCHAR * OkayToCloseProcedure;
} OBJECT_TYPE_INITIALIZER, *POBJECT_TYPE_INITIALIZER;

Windows Vista Kernel Structures