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+++ b/Symbian3/SDK/Source/GUID-44F4089F-7184-5F73-A01E-E0F639D32EA1.dita	Thu Jan 21 18:18:20 2010 +0000
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+<?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-44F4089F-7184-5F73-A01E-E0F639D32EA1" xml:lang="en"><title>System
+Wide Error Codes Overview</title><shortdesc>This is an overview document of error codes used system APIs. </shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
+<section id="GUID-6B6D8FFA-DF27-44D5-AEBF-5CCC81D4C39F"><title>Purpose</title> <p>Provides a core set of error codes that
+may be returned by System APIs. They are defined in e32err.h. </p> </section>
+<section id="GUID-B103B96A-B168-4F3C-821B-AF56D0E35643"><title>Description</title> <p>These error codes are used by System
+APIs to indicate common mathematical, file, communications, and client/server
+errors. These error codes are intended to be generic to reflect the fact that
+many error conditions occur for similar reasons in nearly all software components.
+The errors may also be returned by non-System APIs where appropriate. APIs
+may also use additional error codes where the core set is not sufficient. </p> <p>Error
+codes are returned to clients in three circumstances: </p> <ul>
+<li id="GUID-ED9D2507-15E4-528B-AF04-3D0CC21F758D"><p>as a simple <xref href="GUID-7A2A43EC-6125-3BFE-834B-23C37F7B40D5.dita"><apiname>TInt</apiname></xref> return
+value from a synchronous function </p> </li>
+<li id="GUID-50CC41C2-6EA7-5DCB-A4B8-5092A15A1C53"><p>as a leave code from
+a leaving function, which can be caught in a trap harness </p> </li>
+<li id="GUID-2D401685-8851-574B-A672-47DFAF9F3C52"><p>in a request status,
+when an asynchronous request function completes </p> </li>
+</ul> <p>The complete list can be found at e32err.h. This not only describes
+the symbols used in C++ code, but also the numerical values that those symbols
+represent. </p> <p>In the code itself, the core list is defined in the header
+file <filepath>e32err.h</filepath>. </p> </section>
+<section id="GUID-9B23BFC3-25DB-4578-ABB1-AF4E38431967"><title>See also</title> <p><xref href="GUID-1294F540-FDA7-5050-BAFB-3C9888491B98.dita">Asynchronous
+Services Overview</xref>  </p> <p><xref href="GUID-E5A83EF3-948B-5729-A2CD-3644E803520B.dita">Cleanup
+Support Overview</xref>  </p> </section>
+</conbody></concept>
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