diff -r 89d6a7a84779 -r 25a17d01db0c Symbian3/PDK/Source/GUID-0C3A4156-E5CF-55F9-91A0-A7961FDEE030.dita
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Symbian3/PDK/Source/GUID-0C3A4156-E5CF-55F9-91A0-A7961FDEE030.dita	Fri Jan 22 18:26:19 2010 +0000
@@ -0,0 +1,41 @@
+<?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-0C3A4156-E5CF-55F9-91A0-A7961FDEE030" xml:lang="en"><title>LCD
+Extension Architecture</title><shortdesc/><prolog><metadata><keywords/></metadata></prolog><conbody>
+<p>This topic describes the architecture of the LCD Extension. </p>
+<p>The LCD Extension (or video driver) is implemented as a standard kernel
+extension and is loaded by the kernel at boot time. </p>
+<p>The public interface to the LCD Extension is accessed through the User-Side
+Hardware Abstraction (HAL) interfaces <xref href="GUID-BD00E7FC-C234-3111-87A5-10F79EB0F2B8.dita#GUID-BD00E7FC-C234-3111-87A5-10F79EB0F2B8/GUID-573C49D6-7763-37AE-B2B2-4C8FB1327E21"><apiname>HAL::Get()</apiname></xref> and <xref href="GUID-BD00E7FC-C234-3111-87A5-10F79EB0F2B8.dita#GUID-BD00E7FC-C234-3111-87A5-10F79EB0F2B8/GUID-9454F1B2-D525-3D6D-A872-C6457CACD4FC"><apiname>HAL::Set()</apiname></xref>.
+The LCD Extension registers itself with the kernel as the handler for the <xref href="GUID-7F299BFC-D8A5-3A5A-B8DA-39BF42C99DC6.dita"><apiname>EHalGroupDisplay</apiname></xref> function
+group and implements the functions. </p>
+<p>From Symbian^3 there is a new graphics architecture called <xref href="GUID-D93978BE-11A3-5CE3-B110-1DEAA5AD566C.dita">ScreenPlay</xref>.
+When ScreenPlay is in use, the <xref href="GUID-4C166A49-31F7-5315-B797-F97DB52600BC.dita">Display
+Channel Driver</xref> can provide a logical device driver proxy between the
+Composition Implementation and the LCD Extension. However, the use of the
+Display Channel Driver is optional and implementers may decide not to use
+it. </p>
+<p>When ScreenPlay is not in use, the Graphics <xref href="GUID-9E7D563E-9FFB-5FA9-8944-9CBAC281FDD2.dita">Screen
+Driver component</xref> is a client of the LCD Extension. The Screen Driver
+is platform-specific and must be ported by the device creator. </p>
+<p>The Text Window Server also implements a version of the Screen Driver for
+a simple console user interface. </p>
+</conbody><related-links>
+<link href="GUID-D93978BE-11A3-5CE3-B110-1DEAA5AD566C.dita"><linktext>The ScreenPlay
+Graphics                 Architecture</linktext></link>
+<link href="GUID-F64E6551-670E-5E12-8103-DE504D3EC94F.dita"><linktext>The Non-ScreenPlay
+                Graphics Architecture</linktext></link>
+<link href="GUID-4C166A49-31F7-5315-B797-F97DB52600BC.dita"><linktext>Display Channel
+Driver</linktext></link>
+<link href="GUID-9E7D563E-9FFB-5FA9-8944-9CBAC281FDD2.dita"><linktext>Screen Driver
+                Component</linktext></link>
+</related-links></concept>
\ No newline at end of file