typedef struct _CM_NOTIFY_BLOCK
{
     LIST_ENTRY HiveList;
     LIST_ENTRY PostList;
     PCM_KEY_CONTROL_BLOCK KeyControlBlock;
     PCM_KEY_BODY KeyBody;
     ULONG Filter: 30;
     ULONG WatchTree: 1;
     ULONG NotifyPending: 1;
     SECURITY_SUBJECT_CONTEXT SubjectContext;
} CM_NOTIFY_BLOCK, *PCM_NOTIFY_BLOCK;

Windows Vista Kernel Structures