typedef struct _RTL_HANDLE_TABLE
{
     ULONG MaximumNumberOfHandles;
     ULONG SizeOfHandleTableEntry;
     ULONG Reserved[2];
     PRTL_HANDLE_TABLE_ENTRY FreeHandles;
     PRTL_HANDLE_TABLE_ENTRY CommittedHandles;
     PRTL_HANDLE_TABLE_ENTRY UnCommittedHandles;
     PRTL_HANDLE_TABLE_ENTRY MaxReservedHandles;
} RTL_HANDLE_TABLE, *PRTL_HANDLE_TABLE;

Windows Vista Kernel Structures