

<!-- Title: gatekeeper -->
<html>
<head>
<!--SiteCatalyst code version: G.7. Copyright 1997-2004 Omniture, Inc.
More info available at http://www.omniture.com
-->
<script language="JavaScript">
<!--
var s_pageName="";
var s_server="";
var s_channel="";
var s_pageType="";
var s_prop1="";
var s_prop2="";
var s_prop3="Dr. Dobb's Journal | 187900439 | Bidirectional Debugging: Coming and Going...";
var s_prop4="Bidirectional Debugging: Coming and Going...";
var s_prop5="Development Tools";
var s_prop6="";
var s_prop7="Jonathan Erickson";
var s_prop8="38.103.63.55 | CCBot/1.0 (+http://www.commoncrawl.org/bot.html)";
var s_prop9="";
var s_prop10="";
var s_prop11="";
var s_prop12="";
var s_prop13="http://www.ddj.com/development-tools/dhandler.jhtml";
var s_prop14="";
var s_prop15="";
var s_prop16="";

/* E-commerce Variables */
var s_campaign="";
var s_state="";
var s_zip="";
var s_events="event5";
var s_products="";
var s_purchaseID="";
var s_eVar1="";
var s_eVar2="";
var s_eVar3="";
var s_eVar4="";
var s_eVar5="";
//-->
</script>

<title>Dr. Dobb's | Bidirectional Debugging: Coming and Going... | May 17, 2006</title>
			<META NAME="description" CONTENT="Greg Law explains what bidirectional debugging is, why you might need it, and what's hard about building a bidirectional debugger. (MP3, 5:29 mins.) ">
		<META NAME="keywords" CONTENT="greg,law,explains,what,bidirectional,debugging,why,you,might,need,what's,hard,about,building,debugger,(mp3,5:29,mins.)">
		<META NAME="headline" CONTENT="Bidirectional Debugging: Coming and Going...">
		<META NAME="created" CONTENT="">
	

<link rel="Stylesheet" rev="Stylesheet" href="http://i.cmpnet.com/ddj/styles/Layout.css" type="text/css">
<link rel="Stylesheet" rev="Stylesheet" href="http://i.cmpnet.com/ddj/styles/FontStyles.css" type="text/css">
<link rel="Stylesheet" rev="Stylesheet" href="http://i.cmpnet.com/ddj/styles/newarticle.css" type="text/css">
<script src="https://i.cmpnet.com/ddj/js/popwindow.js"></script>
<script language="javascript">
<!--
function jobsopen(){
      document.getElementById("jobscontainer").style.height = '';
      }

function jobsclose(){
      document.getElementById("jobscontainer").style.height = "41px";
      }

//-->
</script>
<script language="JavaScript" type="text/javascript">
var addtoMethod=1;
var AddURL = document.location.href;
var AddTitle = escape(document.title);

</script>
<script language="JavaScript" src="http://i.cmpnet.com/ddj/ddj/images/add2/add2.js" type="text/javascript"></script> 
</head>
<body  bgcolor="#ffffff" vlink="#006699" link="#006699" marginwidth="0" marginheight="0" topmargin="0" leftmargin="0">
<table cellpadding=0 cellspacing=0>
<tr>
<td><script> var ckRef=document.referrer; if(ckRef && ckRef.indexOf('/as5/redirect/')==-1 || !ckRef) { document.write('<script language="JavaScript" src="http://i.cmpnet.com/shared/omniture/s_code_remote.js"><\/script>'); document.close(); }</script></td>
</tr>
</table>
<!-- End SiteCatalyst code version: G.7. -->

	
		<!-- error getting ad: null(java.lang.NullPointerException) -->
	
	
<!-- CMP LOGO and AD BANNER AT TOP -->
<div id="TopAdContainer">
	<img src="http://i.cmpnet.com/ddj/techweb_logo.gif" width="125" height="42" hspace="15" vspace="0" border="0" align="left" alt="">


		<!-- error getting ad: null(java.lang.NullPointerException) -->
	
</div><br>
 
      <!-- error getting ad: null(java.lang.NullPointerException) --> 
 
<!-- /CMP LOGO and AD BANNER AT TOP -->
<!-- LOGO and USER/PORTAL NAV and SEARCH -->
<table border="0" width="990" cellpadding="0" cellspacing="0" class="elfixo">
	<TR>
		<TD width="1" bgcolor="#000000" rowspan=2><img src="http://i.cmpnet.com/ddj/blank.gif" border="0" width="1" height="1" alt=""></td>
		<TD width="362" colspan="2" bgcolor="#000000"><img src="http://i.cmpnet.com/ddj/blank.gif" border="0" width="362" height="1" alt=""></td>

		<TD width="397" bgcolor="#000000"><img src="http://i.cmpnet.com/ddj/blank.gif" border="0" width="397" height="1" alt=""></td>
		<TD width="1" bgcolor="#000000" rowspan=2><img src="http://i.cmpnet.com/ddj/blank.gif" border="0" width="1" height="1" alt=""></td>
	</TR>
	<TR>
		<TD width="362" align=left valign=middle bgcolor="#349F2C">
			<a href="/"><img src="http://i.cmpnet.com/ddj/logo_ddj.gif" hspace="3" vspace="5" border="0" alt=""></a></td>
	    <TD width="228" align=left valign=top bgcolor="#349F2C"><!-- <span class="fphead">FOCAL POINTS: Sponsored Links</span><br />
		<droplet src="/viewAd.jhtml">
		<param name="pagepos" value="focallink1">  
	</droplet> -->
	</td>
	    <TD align=right valign=middle bgcolor="#349F2C"><!-- SEARCH -->
			<FORM action="/TechSearch/searchResults.jhtml">
			  <input type="text" name="queryText" value="" style="width:290px; height:20px" size="11" class="searchInput" onfocus="this.value=''">
			  <input type="image" src="http://i.cmpnet.com/ddj/search.gif" alt=""  align="absbottom" hspace="3" vspace="0">
		    </FORM>
			<!-- /SEARCH -->
				
		<a style="font: 10px verdana, sans-serif  bold; color: #ffc20e;" href="http://www.ddj.com/TechSearch/searchResults.jhtml;jsessionid=5BHJMY3TJYYK4QSNDLQSKH0CJUNN2JVN">Site Archive (Complete)</a></td>
	</TR>
	<!-- /LOGO, and SEARCH -->
	<TR>
		<TD colspan=5 bgcolor="#000000"><img src="http://i.cmpnet.com/ddj/blank.gif" border="0" width="250" height="1" alt=""></TD>
	</TR>
	<TR>


<TD bgcolor="#000000"></TD>
<TD bgcolor="#FFB305" colspan=3>
	<div class="portalNAVPad">
		<span class=noLINE>
			<a href="/about.html" CLASS=portalNAV>ABOUT US</a> | 
			<a href="/contact.html" CLASS=portalNAV>CONTACT</a> | 
			<a href="/advertise/" CLASS=portalNAV>ADVERTISE</a> | 
			<a href="/subscribe/" CLASS=portalNAV>SUBSCRIBE</a> | 
			<!-- <a href="/pubs/" CLASS=portalNAV>ARCHIVES</a> | -->
			<a href="/code/" CLASS=portalNAV>SOURCE CODE</a> | 
			<a href="/currentIssuePage.html" CLASS=portalNAV>CURRENT PRINT ISSUE</a> | 
			<!-- <a href="`request.getParameter("jiveDomain")+"/jive3/index.jspa"`" CLASS=portalNAV>
				<param name="categoryID" value="param:ddjCategoryID">FORUMS
			</a>| -->
			<a href="/newsletters/" CLASS=portalNAV>NEWSLETTERS</a>
			| 
			<a href="/resources/" CLASS=portalNAV>RESOURCES</a>
			| 
			<a href="http://dobbscodetalk.com/" CLASS=portalNAV>BLOGS</a>
			| 
			<a href="/mediaCenter/" CLASS=portalNAV>PODCASTS</a>
			| 
			<a href="http://www.techcareers.com/?affiliate=ddj" CLASS=portalNAV>CAREERS</a>
		</span>
	</div>
</TD>
<TD bgcolor="#000000"></TD>
	</TR>
	<TR>
		<TD colspan=5 bgcolor="#000000"><img src="http://i.cmpnet.com/ddj/blank.gif" border="0" width="250" height="1" alt=""></TD>
	</TR>
</TABLE>
<div style="height: 14px; width: 990px;">


		<!-- error getting ad: null(java.lang.NullPointerException) -->
	
</div>
	<table border="0" width="900" cellpadding="0" cellspacing="0" class=elfixo>
		
		<TR>
			<td valign=top>
			<!-- LEFT COL -->
				
            
<script language="Javascript">
  function launcher(art_id,urlPrefix,siteUrl) {
 uri = "/article/emailBox.jhtml?articleID=" +art_id+"&urlPrefix="+ urlPrefix+"&host_url="+siteUrl;
  window.open(uri,"","toolbar=no,scrollbars=auto,location=no,status=no,width=480,height=415,resizable=1");
  }
</script>

    
<DIV class="LColMargin">
  
      <a href="/development-tools/"><img src=http://i.cmpnet.com/ddj/header_devtools.gif hspace="0" vspace="0" border="0" alt="Development Tools"></a>
      <img src="http://i.cmpnet.com/ddj/rule.gif" width="405" height="1" hspace="0" vspace="0" border="0" align="left"><BR>
    
</DIV>

<DIV class="articlepadding">


    <table border="0" width="160" cellpadding="0" cellspacing="0" class=elfixo align=right>
    <TR>
    <TD width="10" rowspan=5><img src="http://i.cmpnet.com/ddj/blank.gif" border="0" width="10" height="1"></td>
    <TD width="75"><img src="http://i.cmpnet.com/ddj/blank.gif" border="0" width="75" height="1"></td>
    <TD width="75"><img src="http://i.cmpnet.com/ddj/blank.gif" border="0" width="75" height="1"></td>
    </TR>
    <TR><TD valign=top>

        <img src="http://i.cmpnet.com/ddj/redsquare.gif" width="15" height="12" hspace="0" vspace="0" border="0" align="absmiddle"><a href="javascript:launcher(187900439,'/development-tools/','www.ddj.com')" title="Send As Email">Email</a><BR> <!--
      <img src="http://i.cmpnet.com/ddj/redsquare.gif" width="15" height="12" hspace="0" vspace="0" border="0" align="absmiddle"><a href="#articleComments">Discuss</a>
	  --> 
    </td>
    <TD valign=top>
    <img src="http://i.cmpnet.com/ddj/redsquare.gif" width="15" height="12" hspace="0" vspace="0" border="0" align="absmiddle"><a href="/article/printableArticle.jhtml?articleID=187900439&dept_url=/development-tools/">Print</a><BR>
    <img src="http://i.cmpnet.com/ddj/redsquare.gif" width="15" height="12" hspace="0" vspace="0" border="0" align="absmiddle"><a href="http://www.magreprints.com/QuickQuote.asp" target="_new">Reprint</a>  
    </td></tr>
    <TR>
      <TD height="7" colspan="2" valign="middle" style="padding: 7 0 0 0;"><div align="center"><img src="http://i.cmpnet.com/ddj/ddj/images/dotted_line3.gif" width="140" height="1" hspace="0" vspace="0" border="0"><br><span class="add2header">add to:</span></div></td>
  </tr>
    <TR>
      <TD valign=top><img src="http://i.cmpnet.com/ddj/redsquare.gif" width="15" height="12" hspace="0" vspace="0" border="0" align="absmiddle"><span class="add2ddj" title="Add this page to Delicious" onclick="addto(2)"><u>Del.icio.us</u></span><BR>
        <img src="http://i.cmpnet.com/ddj/redsquare.gif" width="15" height="12" hspace="0" vspace="0" border="0" align="absmiddle"><span class="add2ddj" title="Add this page to Digg" onclick="addto(3)"><u>Digg</u></span><BR>
        <img src="http://i.cmpnet.com/ddj/redsquare.gif" width="15" height="12" hspace="0" vspace="0" border="0" align="absmiddle"><span class="add2ddj"title="Add this page to Google" onclick="addto(5)"><u>Google</u></span><BR>
        <img src="http://i.cmpnet.com/ddj/redsquare.gif" width="15" height="12" hspace="0" vspace="0" border="0" align="absmiddle"><span class="add2ddj" title="Add this page to Furl" onclick="addto(4)"><u>Furl</u></span>
      </td>
      <TD valign=top>   <img src="http://i.cmpnet.com/ddj/redsquare.gif" width="15" height="12" hspace="0" vspace="0" border="0" align="absmiddle"><span class="add2ddj" title="Add this page to Slashdot" onclick="addto(6)"><u>Slashdot</u></span><BR>
        <img src="http://i.cmpnet.com/ddj/redsquare.gif" width="15" height="12" hspace="0" vspace="0" border="0" align="absmiddle"><span class="add2ddj" title="Add this page to Yahoo! MyWeb" onclick="addto(7)"><u>Y! MyWeb</u></span><BR>
        <img src="http://i.cmpnet.com/ddj/redsquare.gif" width="15" height="12" hspace="0" vspace="0" border="0" align="absmiddle"><span class="add2ddj" title="Add this page to Blink" onclick="addto(1)"><u>Blink</u></span>
      </td>
  </tr>
    
        
    </table>
    <DIV class="Bspace4">
    <em>May 17, 2006</em><BR>
    
        <h5>Bidirectional Debugging: Coming and Going...</h5>
        <h2></h2>
      </div>
    
      
            <DIV class="Bspace15"><em>Jonathan Erickson</em></div>
          
      
        <!-- teaser -->
        <DIV class="Bspace15"><span class="greenBlurb">Greg Law explains what bidirectional debugging is, why you might need it, and what's hard about building a bidirectional debugger. (MP3, 5:29 mins.) </span></div>
        <!-- end teaser -->
      
    
    <script language="javascript">
var podcast = "060516je01.mp3";
var title = "Bidirectional Debugging: Coming and Going...";
var artist = "Jon Erickson";
var album = "Dr. Dobb's Portal";
var year = "2006";
var comment = "";
var theURL = window.location.href;
</script>
<script src="http://www.dobbsprojects.com/media/newengine/oasquery_ddj.js"></script>
<script src="http://www.dobbsprojects.com/media/newengine/rotate.js"></script>
<script src="http://www.dobbsprojects.com/media/newengine/mediarss.js"></script>
<script src="http://www.dobbsprojects.com/media/newengine/wimpy.js"></script>
<script src="http://www.dobbsprojects.com/media/newengine/playertemplate.php"></script>


        <div class=Bspace15>
        <em><a href="/authors/authorInfo.jhtml?authorID="><strong></strong></a>  <a href="mailto:"><strong></strong></a></em>
        </div>
      
    
    <center>
    

    </center>
    
    
<!-- ARTICLE COMMENTS-->
<!--
<a name="articleComments"></a>
<br>
<droplet src="/article/articleComments.jhtml"> 
<param name="articleTitle" value="param:element.headline"> 
<param name="articleID" value="param:articleID"> 
<param name="commentsOpen" value="true"> 
</droplet> 
-->
<!-- AROUND THE WEB AND TOP 5 ARTICLES -->
<table border="0" width="467" cellpadding="0" cellspacing="0" class=elfixo>
<tr>
  <td width="229"><img src="http://i.cmpnet.com/ddj/blank.gif" border="0" width="229" height="1"></td>
  <td width="9"><img src="http://i.cmpnet.com/ddj/blank.gif" border="0" width="9" height="1"></td>
  <td width="229"><img src="http://i.cmpnet.com/ddj/blank.gif" border="0" width="229" height="1"></td>
</tr>
<TR>
  <TD valign=top>
  <!-- AROUND THE WEB -->
  <!-- AROUND THE WEB -->
    <div id="GreenContainerBoxSM2">
      <div id="GreenBARSM2"><span class="BARTitles">RELATED ARTICLES</span></div>
      

<div class="PaddingStyle2">
  
  
      <div class="Bspace5">
        <a href="/web-development/212700825">
        Curl Releases Data Services Kit</a>
      </div>
    
    
      <div class="Bspace5">
        <a href="/web-development/212700808">
        Upping the RIA Ante</a>
      </div>
    
    
      <div class="Bspace5">
        <a href="/linux-open-source/212700798">
        FreeBSD 7.1-RELEASE Announced</a>
      </div>
    
    
      <div class="Bspace5">
        <a href="/windows/212700663">
        Parallel LINQ</a>
      </div>
    
    
      <div class="Bspace5">
        <a href="/events/212700629">
        LG Announces Netflix-enabled Broadband HDTVs</a>
      </div>
    
    
</div>
    </div>
  </td>
  <td width="9"><img src="http://i.cmpnet.com/ddj/blank.gif" border="0" width="9" height="1" alt=""></td>
  <TD valign=top>
  <!-- TOP 5 ARTICLES -->
  <div id="GreenContainerBoxSM2"><div id="GreenBARSM2"><span class="BARTitles">TOP 5 ARTICLES</span></div>
    <DIV class="PaddingStyle2">
      

<DIV class="PaddingStyle2">
	
			
					No Top Articles.
				
		
</div>

    </DIV>
  </td>
</tr>
</table>
</DIV>
          
					
			</td>
			<TD width="10"><img src="http://i.cmpnet.com/ddj/blank.gif" border="0" width="10" height="1" alt=""></td>
			<td valign=top>
			<!-- RIGHT COL -->
				

<!-- RIGHT COL -->

<!-- ARTICLE contaier table for media center and departments -->
<table width="575" cellpadding="0" cellspacing="0" border="0" class="elfixo">
<TR> 	<TD width=400 rowspan="2" valign=top>

<!-- YET TO RECEIVE AD PARAMS-->

	<div class="clear">


		<!-- error getting ad: null(java.lang.NullPointerException) -->
	</div>
	
 
<!------------------------DDJ UNIVERSITY --------------->
<!--
<div id="SponsorBar" style="background-color: blue;color: white;">
<span class="miniBARTitles">DR. DOBB'S UNIVERSITY</span>
</div>
<div style="width: 100%; padding: 5px 0px 5px 5px;border: 1px solid black;margin-bottom: 5px;">
Dr. Dobb's new e-learning platform, Dr. Dobb's University, gives you access to select conference sessions from Dr. Dobb's world-class developer events. Available courses focus on such topics as <a href="http://www.ddj.com/architect/ddjuniversity.jhtml">Architecture & Design</a>, <a href="http://www.ddj.com/cpp/ddjuniversity.jhtml">C/C++</a>, <a href="http://www.ddj.com/database/ddjuniversity.jhtml">Database engineering</a>, <a href="http://www.ddj.com/development-tools/ddjuniversity.jhtml">Development tools</a>, <a href="http://www.ddj.com/embedded/ddjuniversity.jhtml">Embedded systems</a>, <a href="http://www.ddj.com/hpc-high-performance-computing/ddjuniversity.jhtml">HPC</a>, <a href="http://www.ddj.com/java/ddjuniversity.jhtml">Java</a>, <a href="http://www.ddj.com/mobile/ddjuniversity.jhtml">Mobility</a>, <a href="http://www.ddj.com/linux-open-source/ddjuniversity.jhtml">Open Source</a>, <a href="http://www.ddj.com/security/ddjuniversity.jhtml">Security</a>, <a href="http://www.ddj.com/web-development/ddjuniversity.jhtml">Web Development</a> and <a href="http://www.ddj.com/windows/ddjuniversity.jhtml">Windows/.NET</a>.

</div> -->


<!----------------------SEARCH JOBS BOX----------------->

<div id="jobscontainer" style="height: 41px; width: 402px; overflow: hidden;">

<form method="post" action="http://www.TechCareers.com/js/action/searchresults.asp?affiliate=ddj&_DARGS=/template_parts/dept/right/right.jhtml" id="form1" name="form1">

<input type="hidden" name="FOrderBy" value="modifydate[d]"> 
<div id="TechCareersBox">
<div id="SponsorBar" style="background-color: teal;">
<span class="miniBARTitles">DR. DOBB'S CAREER CENTER</span>


		<!-- error getting ad: null(java.lang.NullPointerException) -->
	
</div>
<div style="width: 100%; padding: 5px 0px 5px 5px;">
Ready to take that job and shove it? <span style="text-decoration: underline;" class="pointerhand" onclick="jobsopen()">open</span> | <span style="text-decoration: underline;" class="pointerhand" onclick="jobsclose()">close</span><br>
</div>
</div>
<table  width=100% border=0 cellpadding=5 cellspacing=1 bgcolor="000000">
  
  <tr bgcolor="FFFFFF">
    <td colspan="2" valign=top bgcolor="CDE5E8" class="noLINE"> <b>Search jobs on</b> <a class="thirteenBOLD" href="http://www.techcareers.com/?affiliate=ddj">Dr. Dobb's TechCareers</a></td>
    </tr>
  <tr bgcolor="FFFFFF">
      <td width="50%" valign=top> 
<table border=0 cellpadding=0 cellspacing=0 width="100%">
          <tr>
                  <td valign="top">
				   
              <div><strong>Function:</strong><br> <select name='FCareerFocus1' size='1'>
                <option value='23'  >Information Technology</option>
                <option value='25'  >Engineering</option>
              </select></div>
              <br />
                    <div><strong>Keyword(s):</strong><br>
              <input name="FKeywords" size=25></div>
                   <br />
	<div><b>State:</b>�� <input name="FState" size=8 maxlength=2> <input type="submit" value="Go" id=submit1 name=submit1 align="right"></div>
               </td>

          </tr>
        </table>

 </td>
      <td width="50%" valign=top class="noLINE">
	        <!------------------FEATURED JOB----------------->
 
<li><a href="http://www.TechCareers.com/JS/Form/SignUpForm.asp?affiliate=ddj">Post Your Resume</a>               
<li><a href="http://www.TechCareers.com/MKT/Content/EMP/Default.asp?affiliate=ddj">Employers Area</a>
<li><a href="http://www.techcareers.com/content/news.asp?affiliate=ddj">News & Features</a>
<li><a href="http://www.techcareers.com/content/forum.asp?affiliate=ddj">Blogs & Forums</a>
<li><a href="http://www.techcareers.com/JS/CareerResources/?affiliate=ddj">Career Resources</a> 	  
<br><br>
<b>Browse By:</b> <br>
      <A href="http://www.TechCareers.com/JS/JobSearch/?affiliate=ddj">Location</A> | <A href="http://www.TechCareers.com/JS/JobSearch/?affiliate=ddj">Employer</A> | <A href="http://www.TechCareers.com/JS/JobSearch/?affiliate=ddj">City</A><br>
	  

		<!-- error getting ad: null(java.lang.NullPointerException) -->
	
	  </td>
	  </tr> 
	   
  <tr bgcolor="FFFFFF">
    <td colspan="2" valign=top bgcolor="CDE5E8"><b>Most Recent Posts:</b></td>
  </tr>
  <tr bgcolor="FFFFFF">
    <td colspan="2" valign=top class="noLINE">
     <!--  <script language=javascript
src=http://www.4jobs.com/common/partnership/jobs/display.asp?max=4&col=1&par=http://www.techcareers.com&slo=N&vj=N&des=y&ran=Y&i1=23&aor=OR&loc=Y&ind=N&sal=N&comp=Y&bc=FFFFFF&bg=FFFFFF&jbc=FFFFFF&jbg=FFFFFF&pad=5&wid=&tar=n&qsn1=affiliate&qsv1=ddj&date=Y></script> -->
<!-- <script language="javascript" src="http://www.dobbsprojects.com/prox/tcrss.js"></script> -->
<script language="javascript" src="http://i.cmpnet.com/ddj/js/tcrss.js"></script></td>
    </tr>
</table>
</form>
</div>
<DIV class="Bspace15"></DIV>
<!----------------------END SEARCH JOBS BOX----------------->
<br>
<!-- VIDEO BOX -->

	
<!-- END VIDEO BOX -->

<br />

<div align="center">


		<!-- error getting ad: null(java.lang.NullPointerException) -->
	</div>
	<br />


		<TABLE>
			<TR>
				<TD VALIGN="TOP">
					

					<!-- <img src="http://i.cmpnet.com/ddj/rule.gif" width="180" height="1" hspace="0" vspace="0" border="0" alt=""> -->
					<!-- INFO LINK-->
					 

<table width="100" border="0">
  <tr>
    <td valign="top"><!-- MICROSITES -->
					<DIV id="ArticlerightcolBox">
						<div id="TOCBAR"><span class="BARTitles">MICROSITES</span></div>
						<DIV class="PaddingStyle2">
						  <span class="blogName">FEATURED TOPIC</span>		  		  
							

		<!-- error getting ad: null(java.lang.NullPointerException) -->
	
							<br /><br />
							<span class="blogName">ADDITIONAL TOPICS</span>
							

		<!-- error getting ad: null(java.lang.NullPointerException) -->
	
							<br /><br />
							

		<!-- error getting ad: null(java.lang.NullPointerException) -->
	
						</div>
					</div>
	<!-- END MICROSITES --></td>
    <td valign="top"><!-- INFO LINK-->
					<DIV id="ArticlerightcolBox">
<span class="blogName">INFO-LINK</span>
  <DIV class="Bspace5">
  

		<!-- error getting ad: null(java.lang.NullPointerException) -->
	</div>
  <DIV class="Bspace5">
  

		<!-- error getting ad: null(java.lang.NullPointerException) -->
	</div>
  <DIV class="Bspace5">
  

		<!-- error getting ad: null(java.lang.NullPointerException) -->
	</div>
  <DIV class="Bspace5">
  

		<!-- error getting ad: null(java.lang.NullPointerException) -->
	</div>
</div>
					<br></td>
  </tr>
</table>
<!--
<br>
<div align="center"><droplet src="/viewAd.jhtml">
		<param name="pagepos" value="sec2">
	</droplet></div>
	<br> -->
 
					 
				</TD>
				
			    <TD VALIGN="TOP">
				  <!-- MICROSITES -->
				<!--	<DIV id="ArticlerightcolBox">
						<div id="TOCBAR"><span class="BARTitles">MICROSITES</span></div>
						<DIV class="PaddingStyle2">
						  <span class="blogName">FEATURED TOPIC</span>		  		  
							<droplet src="/viewAd.jhtml">
								<param name="pagepos" value="microsite1">
							</droplet>
							<br /><br />
							<span class="blogName">ADDITIONAL TOPICS</span>
							<droplet src="/viewAd.jhtml">
								<param name="pagepos" value="microsite2">
							</droplet>
							<br /><br />
							<droplet src="/viewAd.jhtml">
								<param name="pagepos" value="microsite3">
							</droplet>
						</div>
					</div> -->
					<!-- END MICROSITES -->
					<br />
					
 <!--
<div align="center"><droplet src="/viewAd.jhtml">
		<param name="pagepos" value="jumbobox">
	</droplet></div>
	<br> -->
				<!--	<droplet src="/viewAd.jhtml">
						<param name="pagepos" value="testdrive">
					</droplet> -->
				</TD>
			</TR>
			<tr>
			<td colspan="2">
			<div align="center">


		<!-- error getting ad: null(java.lang.NullPointerException) -->
	</div>
	<br />
			<!-- Industry Brains -->
	 		<script type="text/javascript" src="http://jlinks.industrybrains.com/jsct?sid=644&amp;ct=CMP_SD_DR_DOBBS_JOURNAL_ROS&amp;num=5&amp;layt=1&amp;fmt=simp"></script>
	 		<!-- end Industry Brains -->
			</td>
			</tr>
			
		</TABLE>
	

	<td rowspan="2">
<TD width=10 rowspan="2" VALIGN=top>&nbsp;</TD>
	<TD VALIGN=top width=165>
		<!-- DEPARTMENTS -->
		

<div id="DepartmentBOX"><div id="DepartmentBar"><span class="miniBARTitles">DEPARTMENTS</span></div>
<span class="deptLinks">

<div class="DeptLinkPad"><a href="/?cid=vnav" class="deptLinks">Home</a></div>
  <div id="dividerLine"><img src="http://i.cmpnet.com/ddj/images/blank.gif" hspace="0" vspace="0" border="0" width=5 height=1></div>

    <div class="DeptLinkPad"><a href="/architect/?cid=vnav" class="deptLinks">Architecture & Design</a></div>
  <div id="dividerLine"><img src="http://i.cmpnet.com/ddj/images/blank.gif" hspace="0" vspace="0" border="0" width=5 height=1></div>

  <div class="DeptLinkPad"><a href="/cpp/?cid=vnav" class="deptLinks">C/C++</a></div>
  <div id="dividerLine"><img src="http://i.cmpnet.com/ddj/images/blank.gif" hspace="0" vspace="0" border="0" width=5 height=1></div>

  
  <div class="DeptLinkPad"><a href="/database/?cid=vnav" class="deptLinks">Database</a></div>
  <div id="dividerLine"><img src="http://i.cmpnet.com/ddj/images/blank.gif" hspace="0" vspace="0" border="0" width=5 height=1></div>

    <div class="DeptLinkPad"><a href="/development-tools/?cid=vnav" class="deptLinks">Development Tools</a></div>
  <div id="dividerLine"><img src="http://i.cmpnet.com/ddj/images/blank.gif" hspace="0" vspace="0" border="0" width=5 height=1></div>

  <div class="DeptLinkPad"><a href="/embedded/?cid=vnav" class="deptLinks">Embedded Systems</a></div>
  <div id="dividerLine"><img src="http://i.cmpnet.com/ddj/images/blank.gif" hspace="0" vspace="0" border="0" width=5 height=1></div>
  
  <div class="DeptLinkPad"><a href="/hpc-high-performance-computing/?cid=vnav" class="deptLinks">High Performance Computing</a></div>
  <div id="dividerLine"><img src="http://i.cmpnet.com/ddj/images/blank.gif" hspace="0" vspace="0" border="0" width=5 height=1></div>

  <div class="DeptLinkPad"><a href="/java/?cid=vnav" class="deptLinks">Java</a></div>
  <div id="dividerLine"><img src="http://i.cmpnet.com/ddj/images/blank.gif" hspace="0" vspace="0" border="0" width=5 height=1></div>


  <div class="DeptLinkPad"><a href="/mobile/?cid=vnav" class="deptLinks">Mobility</a></div>
  <div id="dividerLine"><img src="http://i.cmpnet.com/ddj/images/blank.gif" hspace="0" vspace="0" border="0" width=5 height=1></div>

  <div class="DeptLinkPad"><a href="/linux-open-source/?cid=vnav" class="deptLinks">Open Source</a></div>
  <div id="dividerLine"><img src="http://i.cmpnet.com/ddj/images/blank.gif" hspace="0" vspace="0" border="0" width=5 height=1></div>

  
  <div class="DeptLinkPad"><a href="/security/?cid=vnav" class="deptLinks">Security</a></div>
  <div id="dividerLine"><img src="http://i.cmpnet.com/ddj/images/blank.gif" hspace="0" vspace="0" border="0" width=5 height=1></div>

    <div class="DeptLinkPad"><a href="/web-development/?cid=vnav" class="deptLinks">Web Development</a></div>
  <div id="dividerLine"><img src="http://i.cmpnet.com/ddj/images/blank.gif" hspace="0" vspace="0" border="0" width=5 height=1></div>

  <div class="DeptLinkPad"><a href="/windows/?cid=vnav" class="deptLinks">Windows/.NET</a></div>
  <div id="dividerLine"><img src="http://i.cmpnet.com/ddj/images/blank.gif" hspace="0" vspace="0" border="0" width=5 height=1></div>
</span>
<!--<div id="EventBar"><span class="eventBARTitles"><a href="/events/" class="eventBARTitles">Events</a></span></div>-->
</div></DIV>
<!--
<br />
<div id="DepartmentBOXSponsored">
<div class="deptSponsorHeader">&#9830; sponsored</div></div>
  <div id="DepartmentBOXSilverlight">
  <div class="DeptLinkPadSilverlight"><a href="http://www.ddjresources.com/silverlight/" class="deptLinksSilverlight">Resource Center for Microsoft&reg; Silverlight&#8482;</a></div>
  <div id="dividerLine"><img src="`request.getParameter("image_docroot")`images/blank.gif" hspace="0" vspace="0" border="0" width=5 height=1></div> -->
  
 <!-- <div id="EventBar"><span class="eventBARTitles"><a href="/dept/events/" class="eventBARTitles">Events</a></span></div> -->
 </div>
 

		<br>
		<div align="center" width="161" height="601" hspace="0" vspace="0" border="0">
									

		<!-- error getting ad: null(java.lang.NullPointerException) -->
	 
							  </div>
							  <br>
								 

		<!-- error getting ad: null(java.lang.NullPointerException) -->
	
	</TD>
</TR>
</table>
<!-- IMU AD-->


			</td>
		</TR>
	</table>
	
<img src="http://i.cmpnet.com/ddj/rule.gif" width="900" height="1" hspace="5" vspace="10" border="0" align="left" alt="">
<br clear="left">
<!-- AD BANNER AT BOTTOM -->
<div id="BottomAdContainer">


		<!-- error getting ad: null(java.lang.NullPointerException) -->
	
</div>
<!-- /AD BANNER AT BOTTOM -->
<DIV class="LColMargin">
	<table width=900 cellpadding=0 cellspacing=0 border=0 class=elfixo>
		<TR>
			<TD valign=top width=600>
			</TD>
                        <TD valign=top width=300>

                          <!-- put Microsoft Resource Center box on article pages -->
                          

                                  <table cellpadding=1 border=0><tr><td>
                                  <!-- error getting ad: null(java.lang.NullPointerException) -->
                                  </td></tr></table>

                                
                        </TD> 
		</tr>
	</table>
</div>
<img src="http://i.cmpnet.com/ddj/rule.gif" width="900" height="1" hspace="5" vspace="8" border="0" align="left" alt="">
<br clear="left">

<!-- COPYRIGHT AND LINKS -->
<div id="COPYRIGHTContainer">
  <span class="tenBOLD"> 
    <div class="Bspace8">
      <!--<a href="http://www.sdmediagroup.com/reg/faq.html" class=nineBOLD>What are the <span class="green9">green links</span>?</a> |-->
      <!-- The value for parameter category is the same as deptID. It has value when the blog pages are called. -->
      
          
      <!-- a href="/rss/`request.getParameter("file")`" --> <a href="/resources/rss/"><img src="http://i.cmpnet.com/ddj/rss.jpg" hspace="3" vspace="0" border="0" align=absbottom ></a> |  <a href="/resources/rss/" class="tenBOLD">All Feeds</a>
      <!-- <a href="/sitemap/" class="tenBOLD">Site map</a> -->
    </div>
  </span> <span class="tenBOLD"> 
    <div class="Bspace8">
      <a href="http://www.techweb.com/;jsessionid=5BHJMY3TJYYK4QSNDLQSKH0CJUNN2JVN" target="new" class="tenBOLD">� 2009 TechWeb</a>,
      <a href="http://www.cmp.com/delivery/privacy.html" class="tenBOLD">Privacy Policy</a>,
      <a href="http://www.cmp.com/delivery/terms.html" class="tenBOLD">Terms of Service</a>,
	 <a href="http://www.unitedbusinessmedia.com/" class="tenBOLD">United Business Media LLC</a> <BR>
      Comments about the web site: <a href="mailto:webmaster@ddj.com" class="tenBOLD">webmaster@ddj.com</a>
    </div>
    Related Sites: 
    <a href="http://www.dotnetjunkies.ddj.com/" target="_blank" class="tenBOLD">DotNetJunkies</a>,
    <a href="http://www.sdexpo.com/" target="_blank" class="tenBOLD">SD Expo</a>,
    <a href="http://www.sqljunkies.ddj.com/" target="_blank" class="tenBOLD">SqlJunkies</a></span>
</div>
<!-- /COPYRIGHT AND LINKS -->


		<!-- error getting ad: null(java.lang.NullPointerException) -->
	
<!-- start Vibrant Media IntelliTXT script section -->
<script type="text/javascript" src="http://images.intellitxt.com/ast/js/ddj/ddj_edit.js"></script>
<!-- end Vibrant Media IntelliTXT script section -->
</body>
</html>