diff --git a/SDK/INC/NT/ntdef.h b/SDK/INC/NT/ntdef.h
index 29f48e3..7e029db 100644
--- a/SDK/INC/NT/ntdef.h
+++ b/SDK/INC/NT/ntdef.h
@@ -229,10 +229,44 @@ typedef union ULARGE_INTEGER {
 // Doubly-linked list entry.
 //
 typedef struct _LIST_ENTRY {
-    struct _LIST_ENTRY *ForwardLink;
-    struct _LIST_ENTRY *BackLink;
+    struct _LIST_ENTRY *Flink;
+    struct _LIST_ENTRY *Blink;
 } LIST_ENTRY, *PLIST_ENTRY;
 
+FORCEINLINE
+BOOLEAN
+RemoveEntryList (
+    IN PLIST_ENTRY Entry
+    )
+
+/*++
+
+Routine Description:
+
+    Removes a list entry from a list.
+
+Arguments:
+
+    Entry - the entry to remove.
+
+Return Value:
+
+    True if the list is now empty,
+    False if the list still has at least one entry.
+
+--*/
+
+{
+    PLIST_ENTRY Blink, Flink;
+
+    Blink = Entry->Blink;
+    Flink = Entry->Flink;
+    Blink->Flink = Flink;
+    Flink->Blink = Blink;
+
+    return (BOOLEAN)(Flink == Blink);
+}
+
 //
 // Unicode string.
 //
diff --git a/SDK/INC/NT/ntstatus.h b/SDK/INC/NT/ntstatus.h
index d1fa277..cb51bbc 100644
--- a/SDK/INC/NT/ntstatus.h
+++ b/SDK/INC/NT/ntstatus.h
@@ -23,6 +23,7 @@ Abstract:
 //
 #define STATUS_MEDIA_CHANGED           ((NTSTATUS) 0x8000001CL)
 #define STATUS_UNSUCCESSFUL            ((NTSTATUS) 0xC0000001L)
+#define STATUS_NOT_IMPLEMENTED         ((NTSTATUS) 0xC0000002L)
 #define STATUS_INVALID_PARAMETER       ((NTSTATUS) 0xC000000DL)
 #define STATUS_ACCESS_DENIED           ((NTSTATUS) 0xC0000022L)
 #define STATUS_BUFFER_TOO_SMALL        ((NTSTATUS) 0xC0000023L)