diff --git a/headers/private/kernel/util/AVLTreeMap.h b/headers/private/kernel/util/AVLTreeMap.h
index a6a978572b..0ff6c090d9 100644
--- a/headers/private/kernel/util/AVLTreeMap.h
+++ b/headers/private/kernel/util/AVLTreeMap.h
@@ -65,6 +65,9 @@ public:
 
 			Node*				RootNode() const;
 
+			Node*				Previous(Node* node) const;
+			Node*				Next(Node* node) const;
+
 	inline	Iterator			GetIterator();
 	inline	ConstIterator		GetIterator() const;
 
@@ -76,7 +79,10 @@ public:
 
 			status_t			Insert(const Key& key, const Value& value,
 									Iterator* iterator);
+			status_t			Insert(const Key& key, const Value& value,
+									Node** _node = NULL);
 			status_t			Remove(const Key& key);
+			status_t			Remove(Node* node);
 
 			const NodeStrategy&	GetNodeStrategy() const	{ return fStrategy; }
 
@@ -185,6 +191,13 @@ public:
 		return NULL;
 	}
 
+	inline Node* CurrentNode()
+	{
+		if (AVLTreeNode* node = fTreeIterator.Current())
+			return fParent->_GetNode(node);
+		return NULL;
+	}
+
 	inline bool HasNext() const
 	{
 		return fTreeIterator.HasNext();
@@ -270,6 +283,32 @@ _AVL_TREE_MAP_CLASS_NAME::RootNode() const
 }
 
 
+// Previous
+_AVL_TREE_MAP_TEMPLATE_LIST
+inline typename _AVL_TREE_MAP_CLASS_NAME::Node*
+_AVL_TREE_MAP_CLASS_NAME::Previous(Node* node) const
+{
+	if (node == NULL)
+		return NULL;
+
+	AVLTreeNode* treeNode = fTree.Previous(_GetAVLTreeNode(node));
+	return treeNode != NULL ? _GetNode(treeNode) : NULL;
+}
+
+
+// Next
+_AVL_TREE_MAP_TEMPLATE_LIST
+inline typename _AVL_TREE_MAP_CLASS_NAME::Node*
+_AVL_TREE_MAP_CLASS_NAME::Next(Node* node) const
+{
+	if (node == NULL)
+		return NULL;
+
+	AVLTreeNode* treeNode = fTree.Next(_GetAVLTreeNode(node));
+	return treeNode != NULL ? _GetNode(treeNode) : NULL;
+}
+
+
 // GetIterator
 _AVL_TREE_MAP_TEMPLATE_LIST
 inline typename _AVL_TREE_MAP_CLASS_NAME::Iterator
@@ -354,6 +393,32 @@ _AVL_TREE_MAP_CLASS_NAME::Insert(const Key& key, const Value& value,
 }
 
 
+// Insert
+_AVL_TREE_MAP_TEMPLATE_LIST
+status_t
+_AVL_TREE_MAP_CLASS_NAME::Insert(const Key& key, const Value& value,
+	Node** _node)
+{
+	// allocate a node
+	Node* userNode = _Allocate(key, value);
+	if (!userNode)
+		return B_NO_MEMORY;
+
+	// insert node
+	AVLTreeNode* node = _GetAVLTreeNode(userNode);
+	status_t error = fTree.Insert(node);
+	if (error != B_OK) {
+		_Free(userNode);
+		return error;
+	}
+
+	if (_node != NULL)
+		*_node = userNode;
+
+	return B_OK;
+}
+
+
 // Remove
 _AVL_TREE_MAP_TEMPLATE_LIST
 status_t
@@ -368,6 +433,19 @@ _AVL_TREE_MAP_CLASS_NAME::Remove(const Key& key)
 }
 
 
+// Remove
+_AVL_TREE_MAP_TEMPLATE_LIST
+status_t
+_AVL_TREE_MAP_CLASS_NAME::Remove(Node* node)
+{
+	if (!fTree.Remove(node))
+		return B_ENTRY_NOT_FOUND;
+
+	_Free(node);
+	return B_OK;
+}
+
+
 // CompareKeyNode
 _AVL_TREE_MAP_TEMPLATE_LIST
 int
diff --git a/headers/private/kernel/util/TwoKeyAVLTree.h b/headers/private/kernel/util/TwoKeyAVLTree.h
index 9ab0525968..5286ac864a 100644
--- a/headers/private/kernel/util/TwoKeyAVLTree.h
+++ b/headers/private/kernel/util/TwoKeyAVLTree.h
@@ -274,6 +274,9 @@ public:
 
 	inline	int					CountItems() const	{ return fTreeMap.Count(); }
 
+			Node*				Previous(Node* node) const;
+			Node*				Next(Node* node) const;
+
 			Value*				FindFirst(const PrimaryKey& key,
 									Iterator* iterator = NULL);
 			Value*				FindLast(const PrimaryKey& key,
@@ -283,11 +286,15 @@ public:
 									Iterator* iterator = NULL);
 
 	inline	void				GetIterator(Iterator* iterator);
+	inline	void				GetIterator(Node* node, Iterator* iterator);
 
 	inline	status_t			Insert(const Value& value,
-									Iterator* iterator = NULL);
+									Iterator* iterator);
+	inline	status_t			Insert(const Value& value,
+									Node** _node = NULL);
 	inline	status_t			Remove(const PrimaryKey& primaryKey,
 									const SecondaryKey& secondaryKey);
+	inline	status_t			Remove(Node* node);
 
 private:
 			TreeMap				fTreeMap;
@@ -320,6 +327,11 @@ public:
 		return fIterator.CurrentValuePointer();
 	}
 
+	inline Node* CurrentNode()
+	{
+		return fIterator.CurrentNode();
+	}
+
 	inline Value* Next()
 	{
 		fIterator.Next();
@@ -398,6 +410,22 @@ TWO_KEY_AVL_TREE_CLASS_NAME::~TwoKeyAVLTree()
 }
 
 
+TWO_KEY_AVL_TREE_TEMPLATE_LIST
+typename TWO_KEY_AVL_TREE_CLASS_NAME::Node*
+TWO_KEY_AVL_TREE_CLASS_NAME::Previous(Node* node) const
+{
+	return fTreeMap.Previous(node);
+}
+
+
+TWO_KEY_AVL_TREE_TEMPLATE_LIST
+typename TWO_KEY_AVL_TREE_CLASS_NAME::Node*
+TWO_KEY_AVL_TREE_CLASS_NAME::Next(Node* node) const
+{
+	return fTreeMap.Next(node);
+}
+
+
 TWO_KEY_AVL_TREE_TEMPLATE_LIST
 Value*
 TWO_KEY_AVL_TREE_CLASS_NAME::FindFirst(const PrimaryKey& key,
@@ -484,6 +512,14 @@ TWO_KEY_AVL_TREE_CLASS_NAME::GetIterator(Iterator* iterator)
 }
 
 
+TWO_KEY_AVL_TREE_TEMPLATE_LIST
+void
+TWO_KEY_AVL_TREE_CLASS_NAME::GetIterator(Node* node, Iterator* iterator)
+{
+	iterator->_SetTo(fTreeMap.GetIterator(node));
+}
+
+
 TWO_KEY_AVL_TREE_TEMPLATE_LIST
 status_t
 TWO_KEY_AVL_TREE_CLASS_NAME::Insert(const Value& value, Iterator* iterator)
@@ -501,6 +537,17 @@ TWO_KEY_AVL_TREE_CLASS_NAME::Insert(const Value& value, Iterator* iterator)
 }
 
 
+TWO_KEY_AVL_TREE_TEMPLATE_LIST
+status_t
+TWO_KEY_AVL_TREE_CLASS_NAME::Insert(const Value& value, Node** _node)
+{
+	NodeStrategy& strategy
+		= const_cast<NodeStrategy&>(fTreeMap.GetNodeStrategy());
+
+	return fTreeMap.Insert(strategy.GetValueKey(value), value, _node);
+}
+
+
 TWO_KEY_AVL_TREE_TEMPLATE_LIST
 status_t
 TWO_KEY_AVL_TREE_CLASS_NAME::Remove(const PrimaryKey& primaryKey,
@@ -510,4 +557,12 @@ TWO_KEY_AVL_TREE_CLASS_NAME::Remove(const PrimaryKey& primaryKey,
 }
 
 
+TWO_KEY_AVL_TREE_TEMPLATE_LIST
+status_t
+TWO_KEY_AVL_TREE_CLASS_NAME::Remove(Node* node)
+{
+	return fTreeMap.Remove(node);
+}
+
+
 #endif	// _KERNEL_UTIL_TWO_KEY_AVL_TREE_H