--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Symbian3/PDK/Source/GUID-0B23D1B5-3EE1-5874-8605-5C48CB4690F2.dita	Fri Jan 22 18:26:19 2010 +0000
@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
+<!-- This component and the accompanying materials are made available under the terms of the License 
+"Eclipse Public License v1.0" which accompanies this distribution, 
+and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
+<!-- Initial Contributors:
+    Nokia Corporation - initial contribution.
+Contributors: 
+-->
+<!DOCTYPE concept
+  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
+<concept id="GUID-0B23D1B5-3EE1-5874-8605-5C48CB4690F2" xml:lang="en"><title>HAL
+(Hardware Abstraction Layer)</title><shortdesc/><prolog><metadata><keywords/></metadata></prolog><conbody>
+<p>The structure of the HAL has not changed between EKA1 and EKA2, but you
+may still need to make some changes. </p>
+<p>Groups are new, and the HAL handler functions have changed. The location
+of Config files and Values files, the signatures and the behavioural requirements
+of accessor functions for derived attributes have <i>not</i> changed. </p>
+<p>However note that: </p>
+<ul>
+<li id="GUID-4D737F65-0556-50EE-9356-DF147761298F"><p>the implementation of
+existing EKA1 HAL handler functions may need changing to conform with the
+general coding changes required by EKA2; see <xref href="GUID-43BC99CA-9D60-557C-A43C-99EF1D6E4ECF.dita">Important
+Changes between EKA1 and Kernel Architecture 2</xref>. </p> </li>
+<li id="GUID-B2343591-DEB5-5953-992C-8E81031E8BD2"><p>it should rarely be
+necessary to write accessor functions for derived attributes, as all likely
+functions are already implemented in <filepath>...\hal\src\userhal.cpp</filepath>. </p> </li>
+</ul>
+<p>The functions <codeph>UserSvr::HalGet()</codeph> and <codeph>UserSvr::HalSet()</codeph> are
+no longer used. They now return <xref href="GUID-F89DA3F0-2A48-3F9B-8F08-29350E92D0E4.dita"><apiname>KErrNotSupported</apiname></xref> and are
+kept for binary compatibility purposes. </p>
+</conbody></concept>
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