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diff --git a/public/ntree.h b/public/ntree.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//
+//=============================================================================//
+#ifndef __TREE_H__
+#define __TREE_H__
+
+#include "List.h"
+#include "ArrayStack.h"
+
+// NTreeNode: Class decleration and definition
+template <class T> class NTreeNode
+{
+public:
+	// constructor
+	NTreeNode<T>( T data );
+	
+	NTreeNode<T> *PrependChild( NTreeNode<T> *node );
+	NTreeNode<T> *AppendChild( NTreeNode<T> *node );
+	NTreeNode<T> *InsertChildAfterIndex( NTreeNode<T> *node, int index );
+	NTreeNode<T> *InsertChildBeforeIndex( NTreeNode<T> *node, int index );
+	NTreeNode<T> *RemoveChild( Position position );
+	NTreeNode<T> *RemoveChild( int index );
+	Position InsertAfter( NTreeNode<T> *node, Position position );
+	Position InsertBefore( NTreeNode<T> *node, Position position );
+	int GetNumChildren();
+	Position GetChildPosition( int childNum );
+	NTreeNode<T> *GetChild( int childNum );
+	NTreeNode<T> *GetChild( Position position );
+	int GetIndexRelativeToParent();
+	T GetItem();
+	NTreeNode<T> *GetParent();
+	NTreeNode<T> *GetRoot();
+	NTreeNode<T> *GetNextSibling();
+	void Traverse( void (*VisitFunc)( T, int depth ), int maxTreeDepth );
+	NTreeNode<T> *ReentrantTraversalGetFirst( int maxTreeDepth );
+	NTreeNode<T> *ReentrantTraversalGetNext( void );
+	
+protected:
+	GList<NTreeNode<T> * > *list;
+	T data;
+	NTreeNode<T> *parent;
+	ArrayStack<NTreeNode<T> *> *reentrantStack;
+};
+
+template <class T>
+NTreeNode<T>::NTreeNode( T data )
+{
+	list = new GList<NTreeNode<T> * >;
+	this->data = data;
+	this->parent = NULL;
+	this->reentrantStack = NULL;
+}
+
+template <class T>
+NTreeNode<T> *NTreeNode<T>::PrependChild( NTreeNode<T> *node )
+{
+	node->parent = this;
+	return list->GetItemAtPosition( list->InsertAtHead( node ) );
+}
+
+template <class T>
+NTreeNode<T> *NTreeNode<T>::AppendChild( NTreeNode<T> *node )
+{
+	node->parent = this;
+	return list->GetItemAtPosition( list->InsertAtTail( node ) );
+}
+
+template <class T>
+NTreeNode<T> *NTreeNode<T>::InsertChildAfterIndex( NTreeNode<T> *node, int index )
+{
+	node->parent = this;
+	if( index < 0 )
+	{
+		// if out of range in the negative direction, prepend
+		this->PrependChild( node );
+	}
+	else if( index > list->GetNumItems() - 1 )
+	{
+		// if out of range, just append.
+		this->AppendChild( node );
+	}
+	else
+	{
+		Position pos;
+		pos = list->GetPositionAtIndex( index );
+		list->InsertAfter( node, pos );
+	}
+	return node;
+}
+
+template <class T>
+NTreeNode<T> *NTreeNode<T>::InsertChildBeforeIndex( NTreeNode<T> *node, int index )
+{
+	node->parent = this;
+	if( index < 0 )
+	{
+		// if out of range in the negative direction, prepend
+		this->PrependChild( node );
+	}
+	else if( index > list->GetNumItems() - 1 )
+	{
+		// if out of range, just append.
+		this->AppendChild( node );
+	}
+	else
+	{
+		Position pos;
+		pos = list->GetPositionAtIndex( index );
+		list->InsertBefore( node, pos );
+	}
+	return node;
+}
+
+template <class T>
+NTreeNode<T> *NTreeNode<T>::RemoveChild( Position position )
+{
+	NTreeNode<T> **node = ( NTreeNode<T> ** )( void * )position;
+	( *node )->parent = NULL;
+	return list->Remove( position );
+}
+
+template <class T>
+NTreeNode<T> *NTreeNode<T>::RemoveChild( int index )
+{
+	Position position = list->GetPositionAtIndex( index );
+	NTreeNode<T> **node = ( NTreeNode<T> ** )( void * )position;
+	( *node )->parent = NULL;
+	return list->Remove( position );
+}
+
+template <class T>
+Position NTreeNode<T>::InsertAfter( NTreeNode<T> *node, Position position )
+{
+	node->parent = this;
+	return list->InsertAfter( node, position );
+}
+
+template <class T>
+Position NTreeNode<T>::InsertBefore( NTreeNode<T> *node, Position position )
+{
+	node->parent = this;
+	return list->InsertBefore( node, position );
+}
+
+template <class T>
+int NTreeNode<T>::GetNumChildren()
+{
+	return list->GetNumItems();
+}
+
+template <class T>
+Position NTreeNode<T>::GetChildPosition( int childNum )
+{
+	return list->GetPositionAtIndex( childNum );
+}
+
+template <class T>
+NTreeNode<T> *NTreeNode<T>::GetChild( int childNum )
+{
+	return list->GetItemAtIndex( childNum );
+}
+
+template <class T>
+NTreeNode<T> *NTreeNode<T>::GetChild( Position position )
+{
+	return list->GetItemAtIndex( position );
+}
+
+template <class T>	
+int NTreeNode<T>::GetIndexRelativeToParent()
+{
+	if( !parent )
+	{
+		assert( 0 ); // hack
+		return -1;
+	}
+	GListIterator<NTreeNode<T> *> iterator( parent->list );
+	int i;
+	for( i = 0, iterator.GotoHead(); !iterator.AtEnd(); iterator++, i++ )
+	{
+		if( iterator.GetCurrent() == this )
+		{
+			return i;
+		}
+	}
+	assert( 0 ); // hack
+	return -1;
+}
+
+template <class T>
+T NTreeNode<T>::GetItem()
+{
+	return data;
+}
+
+template <class T>
+NTreeNode<T> *NTreeNode<T>::GetParent()
+{
+	return parent;
+}
+
+template <class T>
+NTreeNode<T> *NTreeNode<T>::GetRoot()
+{
+	NTreeNode<T> *node;
+	node = this;
+	while( node->GetParent() )
+	{
+		node = node->GetParent();
+	}
+	return node;
+}
+
+template <class T>
+NTreeNode<T> *NTreeNode<T>::GetNextSibling()
+{
+	int currentID, siblingID;
+	NTreeNode<T> *parent;
+	parent = this->GetParent();
+	if( !parent )
+	{
+		return NULL;
+	}
+	currentID = this->GetIndexRelativeToParent();
+	siblingID = currentID + 1;
+	if( siblingID < parent->GetNumChildren() )
+	{
+		return parent->GetChild( siblingID );
+	}
+	else
+	{
+		return NULL;
+	}
+}
+
+template <class T>
+void NTreeNode<T>::Traverse( void (*VisitFunc)( T, int depth ), int maxTreeDepth )
+{
+	ArrayStack<NTreeNode<T> *> stack( maxTreeDepth );
+	NTreeNode<T> *current, *nextSibling;
+
+	stack.Push( this );	
+	Visit( this->GetItem(), 0 );
+	while( !stack.IsEmpty() )
+	{
+		current = stack.Pop();
+		if( current->GetNumChildren() > 0 )
+		{
+			stack.Push( current );
+			stack.Push( current->GetChild( 0 ) );
+			Visit( current->GetChild( 0 )->GetItem(), stack.GetDepth() - 1 );
+		}
+		else
+		{
+			while( !stack.IsEmpty() && !( nextSibling = current->GetNextSibling() ) )
+			{
+				current = stack.Pop();
+			}
+			if( !stack.IsEmpty() )
+			{
+				stack.Push( nextSibling );
+				Visit( nextSibling->GetItem(), stack.GetDepth() - 1 );
+			}	
+		}
+	}
+}
+
+template <class T>
+NTreeNode<T> *NTreeNode<T>::ReentrantTraversalGetFirst( int maxTreeDepth )
+{
+	if( reentrantStack )
+	{
+		delete reentrantStack;
+	}
+	reentrantStack = new ArrayStack<NTreeNode<T> *>( maxTreeDepth );
+	reentrantStack->Push( this );
+	return this;
+}
+
+template <class T>
+NTreeNode<T> *NTreeNode<T>::ReentrantTraversalGetNext( void )
+{
+	NTreeNode<T> *current, *nextSibling;
+
+	while( !reentrantStack->IsEmpty() )
+	{
+		current = reentrantStack->Pop();
+		if( current->GetNumChildren() > 0 )
+		{
+			reentrantStack->Push( current );
+			reentrantStack->Push( current->GetChild( 0 ) );
+			return current->GetChild( 0 );
+		}
+		else
+		{
+			while( !reentrantStack->IsEmpty() && !( nextSibling = current->GetNextSibling() ) )
+			{
+				current = reentrantStack->Pop();
+			}
+			if( !reentrantStack->IsEmpty() )
+			{
+				reentrantStack->Push( nextSibling );
+				return nextSibling;
+			}	
+		}
+	}
+	delete reentrantStack;
+	reentrantStack = NULL;
+	return NULL;
+}
+
+#endif /* __TREE_H__ */