<?xml version="1.0" encoding="utf-8"?>+
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->+
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<!-- This component and the accompanying materials are made available under the terms of the License +
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"Eclipse Public License v1.0" which accompanies this distribution, +
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->+
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<!-- Initial Contributors:+
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    Nokia Corporation - initial contribution.+
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Contributors: +
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-->+
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<!DOCTYPE concept+
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  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">+
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<concept id="GUID-4DAC39E0-2EC2-40F7-9AEF-4FDA09F1A151" xml:lang="en"><title>Asynchronous+
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Requests</title><shortdesc>This document discusses the use of asynchronous requests by device+
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drivers.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>+
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<p>An asynchronous request is typically used to start an operation on a device+
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that completes at a later point of time. It returns immediately after starting+
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the operation on the device or making a request to the driver. The user side+
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thread is not blocked and can continue with other operations, including issuing+
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other requests (synchronous or asynchronous). </p>+
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<p>A driver lists the available asynchronous request types in an enumeration. </p>+
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</conbody></concept>+
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